The Man who says he can, and the man who says he can not.. Are both correct

Every man knows the smell of his own fart.

He with whom neither slander that gradually soaks into the mind, nor statements that startle like a wound in the flesh, are successful may be called intelligent indeed.

I hear and I forget. I see and I remember. I do and I understand.

If the gentleman is not serious, he will not be respected, and his learning will not be on a firm foundation. He considers loyalty and faithfulness to be fundamental, has no friends who are not like him, and when he has made mistakes, he is not afraid of correcting them.

What is necessary is to rectify names.

Humankind differs from the animals only by a little and most people throw that away.