"Reason, observation, and experience the holy trinity of science."
"Only two things are infinite, the universe and human stupidity, and I'm not sure about the former."Robert Green Ingersoll on Albert Einstein
"Our scientific power has outrun our spiritual power. We have guided missiles and misguided men."Robert Green Ingersoll on Martin Luther King, Jr.
"Science investigates religion interprets. Science gives man knowledge which is power religion gives man wisdom which is control."Robert Green Ingersoll on Martin Luther King, Jr.
"No amount of experimentation can ever prove me right a single experiment can prove me wrong."Robert Green Ingersoll on Albert Einstein
"Bad times have a scientific value. These are occasions a good learner would not miss."Robert Green Ingersoll on Ralph Waldo Emerson
"It is a blessed thing that in every age some one has had the individuality enough and courage enough to stand by his own convictions."
"Anger is a wind which blows out the lamp of the mind."
"Let us put theology out of religion. Theology has always sent the worst to heaven, the best to hell."
"The greatest test of courage on earth is to bear defeat without losing heart."
"We need men with moral courage to speak and write their real thoughts, and to stand by their convictions, even to the very death."