Give your heart to God every day! Why not? He loves you! If you promise to love and serve Him, by His power, and ask Him to bless you in witnessing to others of His love, He will be happy with you! Even though we are cautioned by Jesus not to vow, because we cannot turn one hair of our head white or black, He is talking about any promises that we make in our own strength. The key here is that we cannot keep an oath that we made ‘by our head,’ or by ourselves. But we can vow by the mighty power of God!