If quantum mechanics hasn't profoundly shocked you, you haven't understood it yet.
How wonderful that we have met with a paradox. Now we have some hope of making progress.
Everything we call real is made of things that cannot be regarded as real.
Truth and clarity are complementary.
Prediction is very difficult, especially if it's about the future.
Every great and deep difficulty bears in itself its own solution. It forces us to change our thinking in order to find it.