Immanuel Kant (22 April 1724 – 12 February 1804) was a German philosopher who is a central figure in modern philosophy. In his doctrine of transcendental idealism, he argued that space, time and causation are mere sensibilities; 'things-in-themselves' exist, but their nature is unknowable.Here is a list of some notable quotes and sayings by Kant that have been curated from his works, philosophies, thoughts and life.