Freedom is the alone unoriginated birthright of man, and belongs to him by force of his humanity.
Immanuel KantEnlightenment is man's emergence from his self-imposed immaturity...No thing is required for this enlightenment.. .except freedom; and the freedom in question is the least harmful of all, namely, the freedom to use reason publicly in all matters.
Immanuel KantIn every department of physical science there is only so much science, properly so-called, as there is mathematics.
Immanuel KantThere is a limit where the intellect fails and breaks down, and this limit is where the questions concerning God and freewill and immortality arise.
Immanuel Kant