“If any person is an honest unbeliever and sincerely wants to know God, he will come to a saving faith. Folk with whom I have dealt who say that they cannot believe are not being honest. The fact of the matter is that no man’s eyes are blindfolded unless he himself chooses to be blindfolded. If a person really wants to know God and will give up his sin and turn to Christ, God will make Himself real to him. In our day the problem is that a great many folk do not really mean business with God.” J. Vernon McGee
Jeremiah 9:6 Your dwelling place is in the midst of deceit;
Through deceit they refuse to know Me,” says the Lord.
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Ray Comfort's Daily Evidence 
John 14:6
6 Jesus said to him, “I am the way, and the truth, and the life; no one can come to Him only Jesus may reveal the Father but through Him
Matt 11 :27 and luk 10:22 echoes the same thing