From such crooked wood as that which man is made of, nothing straight can be fashioned.

Out of timber so crooked as that from which man is made nothing entirely straight can be built

Nothing is divine but what is agreeable to reason.

By a lie a man throws away and, as it were, annihilates his dignity as a man

Man must be disciplined, for he is by nature raw and wild

...[T]he sublimity and intrinsic dignity of the command in duty are so much the more evident, the less the subjective impulses favor it and the more they oppose it, without being able in the slightest degree to weaken the obligation of the law or to diminish its validity.