Our costliest expenditure is time.

Love is the affection of a mind that has nothing better to engage it.

An orator without judgment is a horse without a bridle.

We must consider the distinctive characters and the general nature of plants from the point of view of their morphology , their behavior under external conditions, their mode of generation, and the whole course of their life.

I would define boastfulness to be the pretension to good which the boaster does not possess.

Alcmaeon was the first to define the difference between man and animals, saying that man differs from the latter in the fact that he alone has the power of understanding.

True friends visit us in prosperity only when invited, but in adversity they come without invitation.