Every believer is assaulted from time to time by the doubts, for that reason the apostle santiago says that the one who thinks thinks about a thing; he who does not believe also thinks of only one thing; but the doubter is oscillating or fluctuating between two things. This is the same as believing and denying at the same time, which is inappropriate for the human mind and harmful to the Christian's heart. The heart that doubts is a divided heart. For such reason open your eyes to the truth of God revealed in the scriptures allowing the holy spirit to show Jesus Christ in a personal and evident way.
Thanks for sharing @oscar20