To preserve health is a moral and religious duty: for health is the basis of all social virtues; and we can be useful no longer than while we are well.

Being reproached for giving to an unworthy person, Aristotle said, I did not give it to the man, but to humanity.

To expect that the intricacies of science will be pierced by a careless glance, or the eminences of fame ascended without labour, is to expect a peculiar privilege, a power denied to the rest of mankind; but to suppose that the maze is inscrutable to diligence, or the heights inaccessible to perseverance, is to submit tamely to the tyranny of fancy, and enchain the mind in voluntary shackles.

Truth has no gradations; nothing which admits of increase can be so much what it is, as truth is truth. There may be a strange thing, and a thing more strange. But if a proposition be true, there can be none more true.

...it will not always happen that the success of a poet is proportionate to his labor.

He who endeavors to please must appear pleased.

If a man has a science to learn he must regularly and resolutely advance.