Neither shalt thou swear by thy head - For these plain reasons:
2dly. Thou hast nothing which is thy own, and thou shouldst not pledge another's property.
3dly. It never did, and never can, answer any good purpose. And
4thly. Being a breach of the law of God, it is the way to everlasting misery.
Neither shalt thou swear by thy head - This was a common oath. The Gentiles also used this oath. To swear by the head was the same as to swear by the life; or to say, I will forfeit my life if what I say is not true. God is the Author of the life, and to swear by that, therefore, is the same as to swear by him.
Because thou canst not make one hair white or black - You have no control or right over your own life. You cannot even change one single hair. God has all that control; and it is therefore improper and profane to pledge what is God‘s gift and God‘s property; and it is the same as swearing by God himself.
But I say unto you, Swear not at all; neither by heaven; for it is God's throne: nor by the earth; for it is his footstool: neither by Jerusalem; for it is the city of the great King. Neither shalt thou swear by thy head, because thou canst not make one hair white or black. Matthew 5:34-36. RC 71.1
Read in context »The reason for this command is given: We are not to swear “by the heaven, for it is the throne of God; nor by the earth, for it is the footstool of His feet; nor by Jerusalem, for it is the city of the great King. Neither shalt thou swear by thy head, for thou canst not make one hair white or black.” R.V. MB 66.1
All things come of God. We have nothing that we have not received; and, more than this, we have nothing that has not been purchased for us by the blood of Christ. Everything we possess comes to us stamped with the cross, bought with the blood that is precious above all estimate, because it is the life of God. Hence there is nothing that we have a right to pledge, as if it were our own, for the fulfillment of our word. MB 66.2
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