There is, however, a reason that seems to me compelling enough to justify Arrian's citation of the oracle's refusal to recognize the deification of Hephaestion . Lucian, more or less at the same time as Arrian, in De calumnia gives ample space to an excursus on the deification of Hephaestion , a subject that he treats with a critical spirit, ridiculing the whole episode. The narration, in a strongly sarcastic and grotesque tone, accentuates the exaggerated aspect of Alexander's actions in that circumstance: his behavior at the death of his friend is characterized by a childish reaction, which however leads to tyrannical actions. In fact, anyone who did not show sufficient respect for the new god, or smiled at the acts of homage paid to him, would have been punished with death or exile. Lucian even reports an anecdote with a paranormal background: Agathocles of Samos, who had been surprised in tears in front of the tomb of Hephaestion - demonstrating with this behavior that he did not believe in the divinity of the deceased, but considered him just another dead person - would have been condemned to be locked in a cage with a lion if Perdiccas had not promptly intervened by telling how the same deified Hephaestion had appeared to him ( φανέντα ἐ ναργῆ τὸν θεόν ) during the hunt to exonerate the unfortunate man. The strongest moment of Lucian's mockery of Alexander is this: "Alexander reached the point of being proud of himself , because not only was he the son of a god, but he was also capable of creating gods " ( οὐ theoῦ you are the one moon , with moon καὶ theophilus poehn δυνάμενος , De calumnia 17).
Probably in the age of Arrian and Lucian the interest in the divinization of a common deceased had been rekindled after the emperor Hadrian had elevated the dead Antinous, his favorite, to divinity ( 8 ). R. Lambert, who has devoted many pages to defining the nature of the cult of the young Bithynian, notes very acutely that Hadrian issued an edict of divinization in Egypt and was careful not to consult the Senate in Rome about it. In this way he broke the custom according to which “public and formal divinization accompanied by a cult was , in Roman times, quite another matter , far more exclusive , reserved strictly fo the Emperor and his immediate family and conferred by an official edict of the Senate ”( Beloved and God. cit a n. 7, p. 147). Lucian, heavily criticizing Alexander's 'creation of gods', would have actually alluded to what the Roman emperor accomplished through a motu proprio in favor of his beloved, to subtly ridicule him. In the light of Lucian's excursus, the fact that Arrian feels obliged to point out the oracle's denial of Alexander's proposed deification of Hephaestion , a tradition totally opposed to that ridiculed in De calumnia , is not insignificant. We do not know the origin, the dating and the credibility of the news, but it is impossible to avoid the idea that it is a response to Lucian's 'slander' , or – at least – to the environment from which such criticism arose. Only in the philosophical-political climate of the imperial age could it have made sense to underline a fact that, in all likelihood, would have seemed of little interest at the time of Alexander and even in those immediately following. Arrian therefore seems to exploit the rumor to take a position in the contemporary debate on the opportunity of deification: seizing on a (presumed) testimony, neglected by all the other historians, he adds an extra touch to his representation of Alexander as a man "extremely respectful of divinity" ( τοῦ θείου ἐ πιμελέστατος , 7, 28, 1) which he completes in the eulogistic portrait of the Macedonian king at the end of his Anabasis ( 7, 28-30).
At this point I think I can conclude that the most reliable source on the cult of Hephaestion is Diodorus, because – for chronological reasons – he is completely extraneous to the inevitable comparison with Hadrian's behaviour towards Antinous and towards Roman legislation, which distinguishes what emerges from the texts of Lucian and Arrian examined above. The latter then manifests, even more clearly than Lucian, moralistic concerns, already well known, also in another episode referable to the cult of Hephaestion , in which the historian of Nicomedia criticises the alleged letter of Alexander to Cleomenes ( Anab. 7, 23, 6-8). But his are reflections typical of a period much later than the events narrated (9), and have nothing to do with the real historical moment in which the institution of the cult of Hephaestion takes place .
It now remains to ask whether Aristotle, writing in his Nicomachean Ethics, "do not friends perhaps desire for their friends the greatest of goods, for example the existence of gods? ( οὐ bolontai or philosphy tos philos τὰ magpie τῶν ἀγατῶν , οἷον theophilus εἶναι ”, Eth . Nic.8, 9, 1159a 6-7), had not had in mind what Alexander would have done for Hephaestion, now dead, that is, when the last impediment to deification mentioned by the philosopher had disappeared: “If therefore it has been said exactly that the friend wants what is good for the friend and for himself, it will be necessary for him to remain what he is. He will therefore want the greatest goods for him on condition that he is a man .” ( ibid . 9-11, Italian translation by M. Zanatta).
NOTE
1) S. I. Johnston, Restless Dead: Encounters Between the living and the Dead in Ancient Greece, Berkeley, Univ. Of California Press, 1999, pp. 148-149; 152.
2) J. Reames-Zimmerman, Hephaestion Amyntoros: Eminence Grise at the Court of Alexander the Great, Diss. Pennsylvania State University, 1998, pp. 93-94.
3) Cf. J.-P. Vernant , The Heroic Death in Ancient Greece (Paris 1980), trans. it . Genoa 2007, p. 11, p.
4) G. Ekroth , The sacrificial rituals of Greek hero -cults in the early Archaic Hellenistic periods , Liège , International Center for the Study of Religion Ancient Greek , 2002 and Id, 'Heroes and Hero-cult' in A Companion to Greek Religion ( ed by D. Ogden) , Malden MA-Oxford-Victoria, Blackwell 2007, pp.100-114.
5) On the cult of Hephaestion , cf. F. Goukowsky , Essay sur les origins two mythe d'Alexandre (336-270 av.J.-C. , I: Les origins policies , App. XXII, Nancy 1978, pp.204-205; 353-354. L. Prandi, Diodoro Siculo, Historical Library, Book XVII , historical commentary, Milan 2013, pp. XXVIII-XXX; 196-199 (with bibliography ); T. Mavrojannis , 'The “Great Tumulus ” at Amphipolis . Remarks on its chronology in comparison to the debate for the “ deification ” of Hephaistion ', Vestigia. Miscellany of archaeological and historical-religious studies in honor of Filippo Coarelli on his 80th anniversary, edited by Valentino Gasparini, Stuttgart 2016, pp. 645-662 (with bibliography). Recently S. Mueller ( Lexicon of Argead Makedonia , W. Heckel /J. Heinrichs /S. Mueller/F. Pownall eds ., Berlin 2020, s.v. ' Hephaistion ', p. 255) has tried to explain rationally, but in my opinion without any credible source support, that the motive for Alexander's establishment of the cult of Hephaistion was to encourage others to follow his example of loyalty.
6) G. Ekroth,’Heroes and Hero-cults in the Archaic to the early Hellenistic periods’, cit. a n.4, p.331.
7) Cfr. R. Lambert, Beloved and God. The story of Hadrian and Antinous, London 1984, p. 178-180.

Cfr. S. Mueller,’Icons, Images, Interpretations: Arrian, Lukian, Their Relationship, and Alexander at the Kydnos’,Karanos 1, 2018, pp.67-86.
9) I have already highlighted elsewhere the particular position of Arrian, who is not always able to separate his point of view, conditioned by the socio-political environment in which he lives, from the historical reality that he wants to narrate, see A. Veneri, ' Callistene e Alessandro' , ΠΡΑΚΤΙΚΑ THE ' DIETINOS SYNDRIOTH KASISIKON ΣΠΟΥΔΩΝ , ΚΑΒΑΛΑ 24-30 ΑΥΓΟΥΣΤΟΥ 1999, ΤΟΜΟΣ Β ', ΑΘΗΝΑΙ 2002, p. 967 ff.