Because it is God who commanded light to shine out of darkness, who shined in our hearts to give the light of the knowledge of the glory of God in the face of Jesus Christ.
But now, having known God, or rather, having been known by God, how is it that you turn again to the weak and beggarly elements, to which once again you wish to be slaves?
Since you have purified your souls by obedience to the truth through the Spirit in sincere love for the brothers, love one another fervently from a pure heart,
Brothers, I am not writing a new commandment to you, but an old commandment which you have had from the beginning. The old commandment is the word which you heard from the beginning.
If anyone claims, "I love God," and hates his brother, he is a liar; for he who does not love his brother whom he has seen, how is it possible for him to love God whom he has not seen?