"As Kant said in his Critique of Pure Reason, the dove who flies throughout the sky thinks to itself..."

“As Kant said in his Critique of Pure Reason, the dove who flies throughout the sky thinks to itself how much more free it might be without the resistance of air. But what would happen if we took the air away? It is the resistance which makes its flight possible.”

- said by my philosophy of religion professor on the last day of class; it really struck me.  (via tunaandthenarddog)