I spent years, in the early 80s, studying Spinoza and I was pleased to see Einstein referencing him here.

Letter to Eric Gutkind (partial)
Albert Einstein (1954)
Translated from the German by Joan Stambaugh
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Albert Einstein Funny Quotes

1. The only thing that interferes with my learning is my education.

2. As far as the laws of mathematics refer to reality, they are not certain; as far as they are certain, they do not refer to reality.

3. Common sense is the collection of prejudices acquired by age eighteen.