“Knowing it and seeing it are two different things.”

Aphorism (1937), p. 38
Attributed in posthumous publications, Albert Einstein: The Human Side (1979)
Context: Body and soul are not two different things, but only two different ways of perceiving the same thing. Similarly, physics and psychology are only different attempts to link our experiences together by way of systematic thought.

Source: Let It Snow: Three Holiday Romances

Source: ZERO to ONE

Source: Succubus Dreams

Original in German: Du weißt daß ich über die Sache selbst nicht deiner Meinung bin. Daß mir Spinozismus und Atheismus zweyerlei ist. Daß ich den Spinoza wenn ich ihn lese mir nur aus sich selbst erklären kann, und daß ich, ohne seine Vorstellungsart von Natur selbst zu haben, doch wenn die Rede wäre ein Buch anzugeben, das unter allen die ich kenne, am meisten mit der meinigen übereinkommt, die Ethik nennen müsste.
Johann Wolfgang von Goethe, in one of his letters to Friedrich Heinrich Jacobi, 1785
G - L, Johann Wolfgang von Goethe

Source: The Gospel of Sri Ramakrishna (1942), p. 319
Context: The body was born and it will die. But for the soul there is no death. It is like the betel-nut. When the nut is ripe it does not stick to the shell. But when it is green it is difficult to separate it from the shell. After realizing God, one does not identify oneself any more with the body. Then one knows that body and soul are two different things.

Academy of Achievement interview (1991)

Let's Be Frank (1957)
Context: It was extraordinary to be in two places at once, doing two different things — extraordinary, but not confusing. He merely had two bodies which were as integrated as his two hands had been.

Source: Shutter Island