It would not be an exaggeration if I said that doubt is a disease - a disease that takes away faith. Perhaps it would be more appropriate to say that doubt is the rust that eats the iron, the iron-like faith. It is very easy to allow doubts to work, and it is difficult to keep faith. However much evolved a person may be, there comes a time when doubts take hold of him, and the moments he is in doubt the light of intelligence disappears. Therefore there is a constant conflict between doubt and faith. If there was not this enemy who always fights with faith, man could do great things, wonderful things; every man would perform miracles, every man would be perfect. This shows that the greater your faith, the greater person you are; the more deeply rooted your faith, the higher you reach.