Augustine of Hippo
This type of expression is identified as hyperbole in Greek, a designation recognized not only by Greek grammarians but also by those of Latin. Such a rhetorical device appears in this passage from John as well as in numerous other sacred texts. For example, we see phrases like "lift up to heaven their mouths" (Psalms 72:9) and "the hairy temple of him who is stiff-necked in his iniquities" (Psalms 67:22). Scripture is replete with various other expressions and figures of speech, illustrating the richness of biblical language.
For what has crossed the earth, is there anything that has truly transcended all worldly things? What does it signify to dismiss all temporal matters? When he speaks, he does not see himself as someone who might unexpectedly face death; instead, he speaks with a sense of invulnerability, as if he were meant to live forever. His thoughts rise above human frailty, unaware of the fragile vessel in which he exists; he is oblivious to what has been stated concerning such individuals: his spirit will depart, and he will return to his homeland, on that day all his aspirations will come to nothing. Yet these individuals, unmindful of their impending end, express their arrogance and direct their words towards Heaven, elevating themselves above earthly concerns.
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If the thief had been conscious of that final day, the day of reckoning, when he is destined for confinement, he would look more monstrous than he already does; yet escape was still a possibility for him. Where would you flee to elude death? Certainly, that day will arrive. How much longer can you expect to live? What significance does a lengthy existence hold if it must eventually conclude, regardless of its duration? Furthermore, it adds up to nothing at all: what is deemed as a long time is neither genuinely long nor guaranteed. Why does he not reflect on this? Because he has directed his speech towards heaven, while his thoughts have roamed the earth. And they shall find themselves filled with days.