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.
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.
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.