Luke 6:45--The good man out of the good treasure of his heart brings forth what is good; and the evil man out of the evil treasure brings forth what is evil; for his mouth speaks from that which fills his heart.
Our heart is a treasure house where we store those things that control our intellect, emotions, actions, attitudes and will. What we think, believe, how we act and react is determined by that which we have stored in our hearts. We need desperately to hear and heed the words of Solomon, "Watch over your hearts with all diligence, For from it flows the springs of life" (Proverbs 4:23).
Keeping watch over our heart will require that we do as Paul instructs in Philippians 4:8, think on those things that are true, honorable, right, pure, lovely, of good report, excellent and worthy of praise. It will require that we be willing to present our bodies as a living and holy sacrifice, acceptable to God and not be conformed to this world (Romans 12:1-2; 1 John 2:15-17). I love Galatians 2:20, "I have been crucified with Christ; and it is no longer I who live, but Christ lives in me; and the life I now live in the flesh I live by faith in the Son of God, who loved me and gave Himself for me".
If we are going to successfully guard our heart then we must surrender ourselves completely to God and his will. Hear James as he tells us, Submit yourselves to God, Resist the devil and he will flee from you" (James 4:7). What do you think submitting to God means? I don't know how you would answer that question but as for myself, I believe it means that I let him mold my thoughts through his word, I let his word fill my heart and let his word guide my life every step of the way. It is saying "God I surrender all to you, take me, take me now"!
I pray that each of us will have good treasures in our hearts so that we can in confidence say, "Search me, O God, and know my heart; Try me and know my anxious thoughts; And see if there be any hurtful way in me, And lead me in the everlasting way".