This is a powerful revelation:

Unbelief, that is, difficulty in believing, does not come from the lack of evidence; The problem lies in the condition of the human heart, which is to blame for not having enough faith.

The heart does not believe because it saw, it believes because it wills. The unbelieve is as a result of the wars and contentions in the mind that must be subjected by the knowledge of God. Thank you Ma for sharing this.