He who does not have common sense at age thirty will never have it. (Traditional Proverb)
Have the wisdom to abandon the values of a time that has passed and pick out the constituents of the future. An environment must be suited to the age and men to their environment. (Traditional Proverb)
For the ignorant, old age is as winter for the learned, it is a harvest. (Traditional Proverb)
It is less painful to learn in youth than to be ignorant in age (Traditional Proverb)