Sometimes the angels, without assuming any visible shape, give proofs of their presence by intelligible voices, by inspirations, by sensible effects, by dreams, or by revelations of things unknown, whether future or past. Sometimes by striking with blindness, or infusing a spirit of uncertainty or stupidity in the minds of those whom God wills should feel the effects of his wrath; for instance, it is said in the Scriptures that the Israelites heard no distinct speech, and beheld no form on Horeb when God spoke to Moses and gave him the Law.[56] The angel who might have killed Balaam's ass was not at first perceived by the prophet;[57] Daniel was the only one who beheld the angel Gabriel, who revealed to him the mystery of the great empires which were to succeed each other.[58] When the Lord spoke for the first time to Samuel, and predicted to him the evils which he would inflict on the family of the high-priest Eli, the young prophet saw no visible form; he only heard a voice, which he at first mistook for that of the high-priest Eli, not being yet accustomed to distinguish the voice of God from that of a man. The angels who guided Lot and his family from Sodom and Gomorrah were at first perceived under a human form by the inhabitants of the city; but afterwards these same angels struck the men with blindness, and thus prevented them from finding the door of Lot's house, into which they would have entered by force. Thus, then, angels do not always appear under a visible or sensible form, nor in a figure uniformly the same; but they give proofs of their presence by an infinity of different ways--by inspirations, by voices, by prodigies, by miraculous effects, by predictions of the future, and other things hidden and impenetrable to the human mind. St. Cyprian relates that an African bishop, falling ill during the persecution, earnestly requested to have the viaticum administered to him; at the same time he saw, as it were, a young man, with a majestic air, and shining with such extraordinary lustre that the eyes of mortals could not have beheld him without terror; nevertheless, the bishop was not alarmed. This angel said to him, angrily, and in a menacing tone, "You fear to suffer. You do not wish to leave this world. What would you have me do for you?" (or "What can I do for you?") The good bishop comprehended that these words alike regarded him and the other Christians who feared persecution and death. The bishop talked to them, encouraged them, and exhorted them to arm themselves with patience to support the tortures with which they were threatened. He received the communion, and died in peace. We shall find in different histories an infinite number of other apparitions of angels under a human form. Footnotes: [40] Josh. v. 29. [41] Exod. iii. 3, 44. [42] Exod. xiii. xiv. [43] Psalm civ. 4. [44] Ezek. i. 4, 6. [45] Dan. x. 5. [46] Rev. iv. 7, 8. [47] Gen. iii. 24. [48] Numb. xxii. 22, 23. [49] 1 Chron. xxi. 16.