Unfortunately, many Christians think that the spirit of a man is more important than the mind. But I would like to let you know, that your mind is as important as your spirit. For instance, you cannot be saved without your mind.
John 1:12 says:
But as many as received him, to them gave he power to become the sons of God, even to them that believe in his name:
The place of “believe” is not the spirit, but the mind.
To believe is a product of conviction. What you are saying is, “Based on these facts, I agree”. In fact, “believe ” can be defined as mental assent. That is, “I concur. I agree. With these facts at my disposal, I now accept Jesus as my personal Lord and Saviour.”
That is why we can safely say that your mind is the gateway to your life. Nothing gets to you without first passing through your mind.
When the Bible says, ”keep thy heart with all diligence; for out of it are the issues of life” (prov. 4:23), it is talking about paying absolute attention to your mind, because your mind determines your ultimate worth in life.