Processes of reason do not often reach knowledge of truth.  

It was due to a spiritual insight. Great people of history perceived the truth, but where did they perceive it and whence did the perception come? We see something similar in President Washington, whose faith and courage, due to his perception of truth, held the colonies together during the long and often apparently hopeless struggle of the Revolution. We see something of the same thing in the military genius of Napoleon, who always knew, in military matters, the best means to adopt.  We see the same thing in all great men and women. They perceive truth; but truth cannot be perceived until it exists; and there can be no truth until there is a mind to perceive it. Truth does not exist apart from mind. The great people of history were in touch and communication with a mind that knew all knowledge and contained all truth. The same is true of all who manifest wisdom. Wisdom is obtained by reading the mind of God.