Calvin Coolidge said this quote

It is hard to see how a great man can be an atheist. Without the sustaining influence of faith in a divine power we could have little faith in ourselves. We need to feel that behind us is intelligence and love. Doubters do not achieve; skeptics do not contribute; cynics do not create. Faith is the great motive power, and no man realizes his full possibilities unless he has the deep conviction that life is eternally important, and that his work, well done, is a part of an unending plan.

~ Calvin Coolidge

Our government rests upon religion. It is from that source that we derive our reverence for truth and justice, for equality and liberality, and for the rights of mankind. Unless the people believe in these principles they cannot believe in our government. There are only two main theories of government in our world. One rests on righteousness and the other on force. One appeals to reason, and the other appeals to the sword. One is exemplified in the republic, the other is represented by despotism.The government of a country never gets ahead of the religion of a country. There is no way by which we can substitute the authority of law for the virtue of man. Of course we endeavor to restrain the vicious, and furnish a fair degree of security and protection by legislation and police control, but the real reform which society in these days is seeking will come as a result of our religious convictions, or they will not come at all. Peace, justice, humanity, charity—these cannot be legislated into being. They are the result of divine grace.

~ Calvin Coolidge

Knowledge comes, but Wisdom lingers. It may not be difficult to store up in the mind a vast quantity of facts within a comparatively short time, but the ability to form judgments requires the severe discipline of hard work and the tempering heat of experience and maturity.

~ Calvin Coolidge

If we judge ourselves only by our aspirations and everyone else only their conduct we shall soon reach a very false conclusion.

~ Calvin Coolidge