Therefore you shall be perfect, just as your Father in heaven is perfect. (Matthew 5:48)
Church Pulpit Commentary Part II
God’s image.—We need more and more to gaze on God, to look up into His Divine face. The glory of the sun is reflected in the water; so will the light of God be more and more reflected in the soul which is upturned to Him. His image, as it were, will be photographed there. And remember to this end two most important considerations—
(a) God Himself will do the work. We lay open our hearts; He enters; He works.
(b) The great need of care in small matters. Perfection consists in little things. It is just this which our Lord is especially pressing here. The very word is ‘complete,’ aiming at each virtue in its fullness, not at one to the neglect of the others.
I would like to comment briefly on the two “considerations” to contemplate when relating the maturity of the believer with image of God. With God as our standard we first realize that He never gives us a command without empowering us with the means of carrying out His imperatives. God the Holy Spirit is the means of perfecting, growing, and maturing; it is never us and if we try to do it in our own strength we will fail, and fail miserably. The second thing to take in and meditate upon is that the small things do matter; you cannot be complete unless all areas of your life are submitted to the will of God. You cannot be full unless you are complete.
For the earth yields crops by itself: first the blade, then the head, after that the full grain in the head. (Mark 4:28)