anger joined with thine age, is not wisdom.

The wise man through an excess of wisdom is made a fool.

It is but sorrow to be wise when wisdom profits not.

Speak wisdom to a fool and he'll think you have no sense at all

A fool's wild speech confounds the wise.

…but I never shall be very wise, I'm afraid.

No, that is the great fallacy: the wisdom of old men. They do not grow wise. They grow careful.

Love is the wisdom of the fool and the folly of the wise.

"Folly is the only thing that keeps youth at a stay and old age afar off;" as it is verified in the Brabanders, of whom there goes this common saying, "That age, which is wont to render other men wiser, makes them the greater fools."

A fool cannot be convinced or even compelled to renounce his folly.

Whoever among you thinks himself wise must become a fool to be truly wise

The ignorant man is an ox. He grows in size, not in wisdom.

How terrible is wisdom when it brings no profit to the wise.

Cleverness is not wisdom.