Isaiah 59:21

“As for Me, this is My covenant with them,” says the Lord: “My Spirit which is upon you (writing the law of God on the heart), and My words which I have put in your mouth shall not depart from your mouth, no from the mouths of your (true, spiritual) children, nor from the mouth of your children’s children,” says the Lord, “from now and forever.”

When we are born again, the Spirit of God comes upon us, joining our spirit and writing the laws of God on our hearts. God puts words of faith and belief into our hearts and our mouths. We speak that faith according to the Word and pass that faith down to our children. Faith is a gift from God!