Love for God is perfected

Every Christian professes to love God, otherwise he is not qualified to be a Christian. To love God, we observe the first few Commandments --- confess no other God but Yahweh, do not call His name in vain and keep the Sabbath holy. Yet, Moses gave the Israelites and us more Commandments than these. Therefore, we need to love men in order to perfect our love for God. During the Last Supper, Jesus gave his disciples a new commandment.
A new commandment I give to you, that you love one another; even as I have loved you, that you also love one another.
By this all men will know that you are my disciples, if you have love for one another (John 13:34-35).
This is a higher demand than the one stipulated by Moses.
You shall not hate your brother in your heart, but you shall reason with your neighbor, lest you bear sin because of him.
You shall not take vengeance or bear any grudge against the sons of your own people, but you shall love your neighbor as yourself: I am the LORD (Leviticus 19:17-18).
The statue of Moses is practical. We are told to love our neighbour as ourselves. Therefore, it is a secondary, derived step. It begins with self-love. Moses had made a very natural assumption: First of all, you must love yourself. Otherwise, you will not know how to love others. However, Moses' statue suffers from two weaknesses: We are flawed and we are selfish. Psychologists tell us that our ego is imperfect but it is here to stay because it has been formed from our birth through the interaction of our genes with the environment we have been brought up. So, our love for others would be imperfect if we follow the standard of our self-love. What is worse, our selfishness may hinder our effort to follow this statue. We may only love others up to 62% of our full capacity to love ourselves. Anyhow, the statue still holds good for both parties, for both you and me.
However, the commandment of Jesus is noble. We are told to love each other as Jesus has loved us. Now, we have a perfect model to follow. His love for us is God's love which is perfect. Therefore, the first weak point is eliminated. So, we are left with the second weakness. Now, we cannot put the blame on our past and our imperfect ego for all our failures to love our neighours. We only have ourselves to blame as well as to praise when we are able to reach out to care and love the others as Jesus would have done. Therefore, Jesus' commandment is more demanding than Moses'.
In the reading of John's first epistle, we read of a similar admonition.
He who says "I know him" but disobeys his commandments is a liar, and the truth is not in him;
but whoever keeps his word, in him truly love for God is perfected (1 John 2:4-5a).
Scholars believe that John, or an author writing in the authority of John, was fighting against the Gnostism movement in his community, against those who claimed to possess "secret knowledge" that brought salvation. No. Knowledge alone is of no use. Practise what you preach. It was a very pragmatic criterion to evaluate the truthfulness of one's claim. Even Deng Xiao Ping put up a similar criterion for the economic reforms in mainland China thirty years ago. But what exactly is "his commandments"? The following 2 verses are interesting.
Beloved, I am writing you no new commandment, but an old commandment which you had from the beginning; the old commandment is the word which you have heard.
Yet I am writing you a new commandment, which is true in him and in you, because the darkness is passing away and the true light is already shining (1 John 2:7-8).
"I am writing you no new commandment ... Yet I am writing you a new commandment ..." Do they sound contradictory? No, only if this "new commandment" is a word play on the "new commandment" Jesus gave in the Last Supper. The community members should have known this commandment well. It is nothing new yet it is the "new commandment" which Jesus gave.
The next two verses betray the Jewish background of the author.
He who says he is in the light and hates his brother is in the darkness still.
He who loves his brother abides in the light, and in it there is no cause for stumbling (1 John 2:9-10).
The structure is similar to Leviticus 19:17-18. Both of them admonish the people for the hatred of their brothers and encourage them to perfect their love for God ("I am the Lord" & "abides in the light"). Both the negative and the positive sides are covered. In fact, the previous pair of verses follows the same pattern: firstly a negative statement is stated and a positive one follows.

My Lord, help me lead a purposeful life, maturing in perfection day by day. Amen.