You can recognize a small truth because its opposite is a falsehood. The opposite of a great truth is another truth.
When it comes to atoms, language can be used only as in poetry.
Every sentence I utter must be understood not as an affirmation, but as a question.
If quantum mechanics hasn't profoundly shocked you, you haven't understood it yet.
Truth is something that we can attempt to doubt, and then perhaps, after much exertion, discover that part of the doubt is not justified.
Prediction is very difficult, especially if it's about the future.