Imagination is a powerful agent for creating, as it were, a second nature out of the material supplied to it by actual nature.

Science is organized knowledge. Wisdom is organized life.

Religion is the recognition of all our duties as divine commands.

Time is not an empirical concept. For neither co-existence nor succession would be perceived by us, if the representation of time did not exist as a foundation a priori.

Thrift is care and scruple in the spending of one's means. It is not a virtue and it requires neither skill nor talent.

The universal and lasting establishment of peace constitutes not merely a part, but the whole final purpose and end of the science of right as viewed within the limits of reason.

Give me matter, and I will construct a world out of it!