“From the crooked timber of humanity, never was a straight thing made.”

“From such crooked timber as humanity is made of, no straight thing was ever constructed.”

“Out of the crooked timber of humanity, no straight thing was ever made.”

“From the crooked timber of humanity, a straight board cannot be hewn.”

“Out of the crooked timber of humanity, no straight thing was even made.”

“Human beings are never to be treated as a means but always as ends.”

“Act in such a way that you treat humanity, whether in your own person or in the person of any other, never merely as a means to an end, but always at the same time as an end.”