“Every formula which expresses a law of nature is a hymn of praise to God.”

“It is sad to see a woman sacrificing the ties of the affections even to do good.”

“We especially need imagination in science.”

“We travel to learn; and I have never been in any country where they did not do something better than we do it, think some thoughts better than we think, catch some inspiration from heights above our own.”

“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 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.”

“The world of learning is so broad, and the human soul is so limited in power!”

“We especially need imagination in science. It is not all mathematics, nor all logic, but it is somewhat beauty and poetry.”

“For women there are undoubtedly great difficulties in the path but so much the more to overcome. First no woman would say "I am but a woman!" But a woman! What more can you ask to be?”

“Why can a man not act himself be himself and think for himself? It seems to me that naturalness alone is power that a borrowed word is weaker than our own weakness however small we may be.”