Written with the finger of God.
God’s writing
It is said of these tables that they “were the work of God, and the writing was the writing of God, graven upon the tables.” Some infidels have carped at this; and I must say it does seem to me as if it were not human finger, or human stylus, or pen, but God Himself that engraved it; but why should it be thought impossible for God to engrave upon stone? Have we not discovered that the lightning can carry our messages--that the lightning let go at London can print at Dover, as has been more recently shown--is it not found that the very rays of light themselves can engrave the most exquisite and intricate imagery; and should it be thought strange, then, that God should Himself engrave upon stone the Ten Commandments? The fact is, the higher we rise in scientific knowledge, the more we see how true this Book is, how worthy of God to write it, how dutiful in man to believe, and bless Him and rejoice in Him. (J. Cumming, D.D.).