Sincerity is the indispensable ground of all conscientiousness, and by consequence of all heartfelt religion.

In the kingdom of ends everything has either a price or a dignity. Whatever has a price can be replaced by something else as its equivalent; on the other hand, whatever is above all price, and therefore admits of no equivalent, has a dignity. But that which constitutes the condition under which alone something can be an end in itself does not have mere relative worth, i.e., price, but an intrinsic worth, i.e., a dignity.

[Aristotle formal logic thus far (1787)] has not been able to advance a single step, and hence is to all appearances closed and completed.

Freedom can never be comprehended, nor even can insight into it be gained.

When I could have used a wife, I could not support one; and when I could support one, I no longer needed any

All thought must, directly or indirectly, by way of certain characters, relate ultimately to intuitions, and therefore, with us, to sensibility, because in no other way can an object be given to us.

Laws always lose in energy what the government gains in extent.