God, freedom, and immortality are untenable in the light of pure reason.

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

He who has made great moral progress ceases to pray

By a lie, a man... annihilates his dignity as a man.

We ourselves introduce that order and regularity in the appearance which we entitle "nature". We could never find them in appearances had we not ourselves, by the nature of our own mind, originally set them there.

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.

It is not God's will merely that we should be happy, but that we should make ourselves happy