"If you will believe me, you who are young, yours is the golden season of life. As you have heard it called, so it verily is, the seed-time of life; in which, if you do not sow, or if you sow tares instead of wheat, you cannot expect to reap well afterwards, and you will arrive at little. And in the course of years when you come to look back, if you have not done what you have heard from your advisers,-and among many counsellors there is wisdom,-you will bitterly repent when it is too late."

Source: John Stuart Mill, Thomas Carlyle (2010). “Autobiography of J.S. Mill & on Liberty; Characteristics, Inaugural Address at Edinburgh & Sir Walter Scott”, p.377, Cosimo, Inc.