Isocrates Quote

Believe that many precepts are better than much wealth; for wealth quickly fails us, but precepts abide through all time; for wisdom alone of all possessions is imperishable. Do not hesitate to travel a long road to those who profess to offer some useful instruction; for it were a shame, when merchants cross vast seas in order to increase their store of wealth, that the young should not endure even journeys by land to improve their understanding.

Verse 19; variant translation: Of all our possessions, wisdom alone is immortal. As quoted in Dictionary of Quotations (Classical) (1906), edited by Thomas Benfield Harbottle, p. 495. - To Demonicus