Metaphysics is a dark ocean without shores or lighthouse, strewn with many a philosophic wreck.
All human knowledge thus begins with intuitions, proceeds thence to concepts, and ends with ideas.
Two things fill the mind with ever new and increasing admiration and awe, the oftener and more steadily we reflect on them: the starry heavens above and the moral law within.
If it were possible for us to have so deep an insight into a man's character as shown both in inner and in outer actions, that every, even the least, incentive to these actions and all external occasions which affect them were so known to us that his future conduct could be predicted with as great a certainty as the occurrence of a solar or lunar eclipse, we could nevertheless still assert that the man is free.
Our intellect does not draw its laws from nature, but it imposes its laws upon nature.
An organized product of nature is that in which all the parts are mutually ends and means.
In every department of physical science there is only so much science, properly so-called, as there is mathematics.
The infinitude of creation is great enough to make a world, or a Milky Way of worlds, look in comparison with it what a flower or an insect does in comparison with the Earth.
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.
Knowledge of the sciences is so much smoke apart from the heavenly science of Christ.
In the Universe the difficult things are done as if they were easy.
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