2 Timothy 1:13
Hold fast the form of sound words, which you have heard of me, in faith and love which is in Christ Jesus.
I have heard people say that it cannot matter much what a man believes, so long as he lives up to right moral principles. They might as well remark that it does not matter if the beams of a house are rotten, so long as the door-plate is bright. Where will be the doorplate when the house falls? A hazy creed means a mazy life. A man's faith is the mainspring of his actions. He who believes nothing will do nothing, till the devil finds him work. I record as my own experience that when the foundations of faith rocked the superstructure of practice reeled.
Parallel VersesKJV: Hold fast the form of sound words, which thou hast heard of me, in faith and love which is in Christ Jesus.