To maintain the most intimate relationship with God, I see the absolute necessity of being truthful to him. By that I mean laying yourself open before him, hiding nothing but revealing everything. You want the Lord to see everything in your heart, your mind, and your soul to let him help you understand and see so that he may guide and heal you. If you are closed to him, then he cannot help you. So, be truthful to God and you'll be truthful to yourself too.