Sirach 6:18

18 My son, gather instruction from thy youth up: so shalt thou find wisdom till thine old age.

Sirach 6:18 In-Context

16 A faithful friend is the medicine of life; and they that fear the Lord shall find him.
17 Whoso feareth the Lord shall direct his friendship aright: for as he is, so shall his neighbour be also.
18 My son, gather instruction from thy youth up: so shalt thou find wisdom till thine old age.
19 Come unto her as one that ploweth and soweth, and wait for her good fruits: for thou shalt not toil much in labouring about her, but thou shalt eat of her fruits right soon.
20 She is very unpleasant to the unlearned: he that is without understanding will not remain with her.

The Brenton translation of the Septuagint is in the public domain.