Proverbs 18:1-2
He who (willingly) separates himself (from God and man) seeks his own desire; he quarrels against all sound wisdom. A (closed-minded) fool does not delight in understanding, but only in revealing his personal opinions (unwittingly displaying his self-indulgence and his stupidity).
We have free will to think and do whatever we wish. Whether we choose to follow our own created beliefs or act according to God’s Word will be the deciding factor. Men do not govern themselves well without a God. Selfishness and sin will creep into their thinking and actions towards others. We need God’s connection to be our best selves.