That which you know, know not; and that which you see, see not.
Even the whole of life is not sufficient for thorough learning.
How often the highest talent lurks in obscurity.
Love has both its gall and honey in abundance: it has sweetness to the taste, but it presents bitterness also to satiety.
It is well for one to know more than he says.
That man is worthless who knows how to receive a favor, but not how to return one.