The mortal race is far too weak not to grow dizzy on unwonted brights.

Courage and modesty are the most unequivocal of virtues, for they are of a kind that hypocrisy cannot imitate; they too have this quality in common, that they are expressed by the same color.

Self knowledge is best learned not by contemplation, but by action.

Experiments are mediators between nature and idea.

Art is long, life is short; judgement difficult, opportunity transient.

Basic characteristics of an individual organism: to divide, to unite, to merge into the universal, to abide in the particular, to transform itself, to define itself, and as living things tend to appear under a thousand conditions, to arise and vanish, to solidify and melt, to freeze and flow, to expand and contract. Since these effects occur together, any or all may occur at the same moment.

Be always resolute with the present hour. Every moment is of infinite value.