When thinking of commandments, think of this: Jesus fulfilled the law (Matthew 5:17). He was the end of the law for righteousness (Romans 10:4). What do these things mean? The law of the Spirit of life has overcome the law of sin and death (Romans 8:2). It is not just a law. The principle is the Spirit of life.
The Holy Spirit sheds love abroad in our hearts (Romans 5:5), and we walk in love as His dear children (Ephesians 5:2). The commandment Jesus is talking about is a Finished Work commandment. He is saying to us, “I finished making a way for you; I am available to you. I am faithful to call you, and I will do what you desire according to my word as you execute your faculties to make choices to believe and obey the truth in your own soul.”
Jesus’ commandment is that we would walk in divine love, and that commandment is not grievous (1 John 5:3). It does not cause sorrow. It is not difficult because God does it.