Common sense, which helped him to look carefully before he invested his money.
Promptness.
Keeping his word.
Mr. Cooper was honorable in all his business.
Once he said to a friend who had an interest in the Trenton works:
"I do not feel quite easy about the amount we are making. We are making too much money. It is not right."
The price was made lower at once.
Do you not think Peter Cooper was an unusual kind of a man to lower the price of an article just because the world needed it so much?
He was now sixty-four years of age.
He had worked day and night for forty years to build his Free College.