Disbelief comes from pride. Proud people reckon they always know best, through their mind and through science, but knowledge of God is always beyond them, because God can be known only through revelation by the Holy Spirit. The Lord is revealed to humble souls. It is to these that He shows His works, which are incomprehensible to our mind. With our natural mind we can understand only earthly things and even these no more than partially, whereas God and the things in heaven are known through the Holy Spirit.