Luke 1:47 - Coke's Commentary on the Holy Bible

My spirit hath rejoiced— When a person, speaking of himself, mentions his soul or spirit as doinga thing, it is the strongest expression in human language, and intimates his doing the thing mentioned with the utmost energy of all his faculties: Mary, therefore, by saying, that her soul magnified the Lord, and that her spirit rejoiced in God, meant to declare, that she exerted the utmost vigour of all her faculties in setting forth the perfections of God, which constitute his greatness: and that the consideration of his goodness towards her, filled her withjoy, to the utmost extent of her capacity.