Minds ripen at very different ages.

Usually youth is for freedom and reform, maturity for judicious compromise, and old age for stability and repose.

If the painter has clumsy hands, he will be apt to introduce them into his works, and so of any other part of his person, which may not happen to be so beautiful as it ought to be. He must, therefore, guard particularly against that self-love, or too good opinion of his own person, and study by every means to acquire the knowledge of what is most beautiful, and of his own defects, that he may adopt the one and avoid the other.

The stomach is the only part of man which can be fully satisfied. The yearning of man's brain for new knowledge and experience and for more pleasant and comfortable surroundings never can be completely met. It is an appetite which cannot be appeased.

Ignorance is the curse of God; knowledge is the wing wherewith we fly to heaven.

Books are infinite in number and time is short. The secret of knowledge is to take what is essential. Take that and try to live up to it.