Necessity is literally the mother of invention.

When there is an income tax, the just man will pay more and the unjust less on the same amount of income.

The god of love lives in a state of need. It is a need. It is an urge. It is a homeostatic imbalance. Like hunger and thirst, it's almost impossible to stamp out.

Truthfulness. He will never willingly tolerate an untruth, but will hate it as much as he loves truth... And is there anything more closely connected with wisdom than truth?

Let nobody speak mischief of anybody.

It is vain for the sober man to knock at poesy's door.

What is at issue is the conversion of the mind from the twilight of error to the truth, that climb up into the real world which we shall call true philosophy.