Question everything.
From Maria Mitchell
People have to learn sometimes not only how much the heart, but how much the head, can bear.
The world of learning is so broad, and the human soul is so limited in power!
Every formula which expresses a law of nature is a hymn of praise to God.
The love of one's own sex is precious, for it is neither provoked by vanity nor retained by flattery; it is genuine and sincere.
We have a hunger of the mind which asks for knowledge of all around us, and the more we gain, the more is our desire; the more we see, the more we are capable of seeing.
I have worn myself thin trying to find out about this comet, and I know very little now in the matter.
I was a little doubtful about the propriety of going to the Mammoth Cave without a gentleman escort, but if two ladies travel alone they must have the courage of men.
That knowledge which is popular is not scientific.
We especially need imagination in science.
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