The right explanation of unbelief would be that everything that is strange to man he explains by reason and by knowledge already acquired, and when something does not tally with what he already knows, he disbelieves. Doubt is earth-born, and belief is heaven-born. Light is caused by the sun, and shade is caused by the earth. The light of the soul, therefore, is belief; the mind gives unbelief. In belief a hidden power exists, and that power is called self-confidence. The person who trusts another does not always trust by the power and influence of another person, but by his own power and confidence.