It is often necessary to make a decision on the basis of knowledge sufficient for action but insufficient to satisfy the intellect.

The possession of power inevitably spoils the free use of reason.

Whereas the beautiful is limited, the sublime is limitless, so that the mind in the presence of the sublime, attempting to imagine what it cannot, has pain in the failure but pleasure in contemplating the immensity of the attempt

The science of mathematics presents the most brilliant example of how pure reason may successfully enlarge its domain without the aid of experience

In the mere concept of one thing it cannot be found any character of its existence.

Two things fill the mind with ever new and increasing admiration and awe, the more often and steadily we reflect upon them: the starry heavens above me and the moral law within me. I do not seek or conjecture either of them as if they were veiled obscurities or extravagances beyond the horizon of my vision; I see them before me and connect them immediately with the consciousness of my existence.

If man makes himself a worm he must not complain when he is trodden on.