My son! I speak to you now that you are young. You should notice that repentance is easier for young people and self-edification is accomplished more easily. In old people, carnal passions, ambition, love of wealth and egotism are stronger than in young people. Young people enjoy a more delicate and flexible spirit. The amount of the love of self and the world in young people is less strong than in the old. Young people can relatively easily rid themselves of the evil influence of carnal passion and turn to spirituality. In assemblies of preaching and ethics the young people are much more easily impressed than the old ones. Young people should be wary lest they should be entrapped by the temptations of the self and Satan. Death is equally close to the young and the old. Which young person can be sure that he/she will grow old? Who can claim to be immune from the events of the universe? Accidents of everyday life are closer to young people.
My son! Do not lose the opportunity and edify yourself in your young days.
(Sahifeh-ye Imam, Vol. 16, P. 222)