“Not all that is mortal is useless.”
“All men are mortal. Socrates was mortal. Therefore, all men are Socrates.”
“If two men on the same job agree all the time, then one is useless. If they disagree all the time, both are useless.”
“The only excuse for making a useless thing is that one admires it intensely. All art is quite useless.”
“All art is quite useless.”
“The barrenest of all mortals is the sentimentalist”