If we want to be like Jesus, we must show justice, kindness, and mercy. Instead of applying law to others, we must apply grace, treating others like God has treated us. Religious legalism excuses and justifies our lack of love. Our unwillingness to be involved in the lives of others. Our willingness to write others off as hopeless cases.
Legalism majors on the minors.
It concentrates on keeping a set of negative rules, at the expense of the positive command of God to love. Now you must have both commandments together. You can't say that you love God if you don't love your neighbour. For anyone who does not love his brother, whom he has seen, cannot love God, whom he has not seen. But you can't just have the second greatest commandment without the first, either.