While God has given ample evidence for faith, He will never remove all excuse for unbelief. All who look for hooks to hang their doubts upon will find them. And those who refuse to accept and obey God's word until every objection has been removed, and there is no longer an opportunity for doubt, will never come to the light.... DD 11.3
There is but one course for those to pursue who honestly desire to be freed from doubts. Instead of questioning and caviling concerning that which they do not understand, let them give heed to the light which already shines upon them, and they will receive greater light. Let them do every duty which has been made plain to their understanding, and they will be enabled to understand and perform those of which they are now in doubt. DD 11.4
Satan can present a counterfeit so closely resembling the truth that it deceives those who are willing to be deceived, who desire to shun the self-denial and sacrifice demanded by the truth; but it is impossible for him to hold under his power one soul who honestly desires, at whatever cost, to know the truth. Christ is the truth and the “Light, which lighteth every man that cometh into the world.” John 1:9. The Spirit of truth has been sent to guide men into all truth. And upon the authority of the Son of God it is declared: “Seek, and ye shall find.” “If any man will do His will, he shall know of the doctrine.” Matthew 7:7; John 7:17. DD 12.1