Immanuel Kant
After finishing his study in the university, Kant hoped to be a teacher of philosophy, but it was very difficult. He could have lived a life of private lecturer as interested in physics, both astronomical objects (such as planets and stars) and the earth. He wrote some papers about this, but he became more interested in metaphysics. He wanted to learn the nature of human experience: how humans could know something, and what their knowledge was based on.