Make it thy business to know thyself, which is the most difficult lesson in the world

Wine in excess keeps neither secrets nor promises.

The guts carry the feet, not the feet the guts.

The proof of the pudding is the eating.

The stomach carries the heart, and not the heart the stomach.

No fathers or mothers think their own children ugly; and this self-deceit is yet stronger with respect to the offspring of the mind.

The fear thou art in, Sancho," said Don Quixote, "prevents thee from seeing or hearing correctly, for one of the effects of fear is to derange the senses and make things appear different from what they are; if thou art in such fear, withdraw to one side and leave me to myself, for alone I suffice to bring victory to that side to which I shall give my aid;" and so saying he gave Rocinante the spur, and putting the lance in rest, shot down the slope like a thunderbolt.