科学界的女性永远不应怀疑自己改变世界的能力。

All you have to do is write one true sentence. Write the truest sentence that you know.

You are too generous to trifle with me. If your feelings are still what they were last April, tell me so at once. My affections and wishes are unchanged, but one word from you will silence me on this subject for ever.

The rocks may be hard, but our resolve must be harder.