Ecclesiastes

Ecclesiastes: "For who knoweth what is good for man in this life, all the days of his vain life which he spendeth as a shadow? for who can tell a man what shall be after him under the sun" (Ecclesiastes 6:12). "For that which befalleth the sons of men befalleth beasts; even one thing befalleth them: as the one dieth, so dieth the other; yea, they have all one breath; so that a man hath no preeminence above a beast: for all is vanity. All go unto one place; all are of the dust, and all turn to dust again" (Ecclesiastes 3:19).

Wisdom of Solomon: "For the ungodly said, reasoning with themselves, but not aright, Our life is short and tedious, and in the death of a man there is no remedy: neither was there any man known to have returned from the grave" (Wisdom of Solomon 2:1)

Ecclesiastes: "And I gave my heart to seek and search out by wisdom concerning all things that are done under heaven: this sore travail hath God given to the sons of man to be exercised therewith" (Ecclesiastes 1:13). "All this have I proved by wisdom: I said, I will be wise; but it was far from me. That which is far off, and exceeding deep, who can find it out?" (Ecclesiastes 7:23).

Ben Sira: "Seek not out the things that are too hard for thee, neither search the things that are above thy strength. But what is commanded thee, think upon with reverence; for it is not needful for thee to see with thine eyes the things that are in secret. Be not curious in unnecessary matters: for more things are shewed unto thee than men understand" (Sirach 3:21).