A well-spent day brings happy sleep.
The organ of perception acts more readily than judgment.
Old age takes in part savoury wisdom for its food - see to that your old age will not lack in nourishment.
There is no higher or lower knowledge, but one only, flowing out of experimentation.
He who is fixed to a star does not change his mind.
Perspective is a most subtle discovery in mathematical studies, for by means of lines it causes to appear distant that which is near, and large that which is small.