The man will be, by then, at the end of his journey of learning, and almost without warning he will come upon the last of his enemies: OLD AGE! This enemy is the cruelest of all, the one he won’t be able to defeat completely, but only fight away.
This is the time when a man has no more fears, no more impatient clarity of mind – a time when all his power is in check, but also the time when he has an unyielding desire to rest. If he gives in totally to his desire to lie down and forget, if he soothes himself in tiredness, he will have lost his last round, and his enemy will cut him down into a feeble old creature. His desire to retreat will overrule all his clarity, his power, and his knowledge.
But if the man sloughs off his tiredness, and lives his fate through, he can then be called a man of knowledge, if only for the brief moment when he succeeds in fighting off his last, invincible enemy. That moment of clarity, power, and knowledge is enough.
(translated to Ukrainian by Oleksandr Korytskyy here).