Pascal was a gifted French mathematician and defender of the scientific method. It is understood that he had a mystical experience in his thirties, about which he told no one, only writing a memorial to it on the inside of his coat. This was discovered after his death. Part of the peom read:

God of Abraham, God of Isaac, God of Jacob,
Not of the philosophers and scholars.
Certitude. Certitude. Feeling. Joy. Peace.
God of Jesus Christ.
“Thy God and my God.”
Forgetfulness of the world and of everything, except God.
He is to be found only in the ways taught in the Gospel.
Greatness of the Human Soul.

“Righteous Father, the world hath not known Thee, But I have known Thee.”

Pascal was fairly clear that the the traditional arguments for God did not work and that they did not, even if they had worked, lead to the God of Christian faith. As such he proposed another sort of argument ‘for’ belief in God…