It is more important that a proposition be interesting than that it be true.

Nobody has a right to speak more clearly than he thinks.

Nature, even in the act of satisfying anticipation, often provides a surprise.

Error is the price we pay for progress.

Religion is what the individual does with his own solitariness.

The guiding motto in the life of every natural philosopher should be, seek simplicity and distrust it.

The safest general characterization of the European philosophical tradition is that it consists of a series of footnotes to Plato.