Does the love of God fulfil the Law, or keep the Law, or both? (Reformed view)

I'm now answering this question myself two years later.

Both of the introductory statements are false in a narrow sense, but true in a broad sense. According to the Reformed view, the following would be more precisely true:

"If you love me, you will [by nature] show it by doing what I’ve told you."

That is, according to the reformed view

• a true believer will have a love to God given by the Holy Spirit,
• this love inevitably compels the believer to walk pleasing before God, i.e. to do what Jesus said.

Nevertheless, Jesus is not asking to "prove" by obedience that we love Him. He is stating that obedience will be a natural consequence of the love. In that sense, "the love of God fulfills the Law" would be more correct.

you are not in the flesh but in the Spirit, if indeed the Spirit of God dwells in you - Romans 8:9

Meaning in reformed context that believers will by nature seek to please God. Context of chapter 8 is mortification of sin.

Neither is He saying that the love itself, by itself, is the fulfillment of His law. Correctly applying and keeping His commandments still involves our active free will, and faculties such as conscience, wisdom, knowledge and compassion. In that sense "the love of God keeps the Law" would be more correct.

Now lastly - and this is where the question becomes a bit confusing - love to God an neighbor is the ultimate principle in the above obedience. So the love is not only the motivation, but also the principle by which the law is correctly applied in our active obedience.

the whole Law is fulfilled in one word, in the statement, "You shall love your neighbor as yourself." (Gal 5:14)

Instruction is seen as necessary, primarily to edify our understanding of what it means to love God and neighbor.

Reformers will dismiss any laws in the Bible that are not rooted in the above principle of love to God and neighbor as "ceremonial" for the Jews, or "civil" law, meaning they are not applicable by Christians. There is in-house debate if the Sabbath commandment is among the "moral laws", to be kept on Sunday (not Saturday) following the coming of Christ.

The reformers call outward obedience without love to God "legalism," and on the other hand, love, so called, without obedience to the Law, "anti-nomianism" (from the Greek, Against-Law, or lawlessness).

It is also worth pointing out that the reformed view teaches that obedience is not a requirement for justification. A believer's justification cannot improved or diminished by acts of obedience or disobedience. Justification is by faith alone (sola fide).

In the same breath, the reformed view is that our obedience is not because of fear of hell, but because of love towards God following His receiving us.

It is also taught that a true conversion can be measured by the presence of some fruit of obedience. The absence of all obedience is taken as a sign that the love of God, hence the Holy Spirit, is not present in a person, meaning that conversion has not (yet) taken place.

This is a struggle that a great many people are experiencing, and is the same struggle that the first century AD churches had to contend with the Judaizers.

Christ's love fulfilled the law (Matt. 5:17).

Rom. 13:8,

"Owe no one anything except to love one another, for he who loves another has fulfilled the law." (NKJV)

Paul addresses the issue in Galatians of trying to keep the law while being in grace under Christ's law. The Judaizers had come back through the churches after Paul and the apostles taught the gospel of Christ, and were telling the new born Christians that they had to be circumcised first and then had to keep certain other Mosaic laws before they could be in Christ.

Their attempt to exist in both the death of the law, and the living grace of Christ defeats Christ's sacrifice for sin which was under the law.

So, Gal. 5:14 is the answer as you have noted above. Loving one another is the fulfillment of the law.

Paul got so angry with those that had tried to damage the congregation in Galatia for teaching they had to be circumcised that he said he would rather they had been cut off.

Gal. 5:12,

"I could wish that those who trouble you would even cut themselves off!" (NKJV)

Most people miss what Paul really meant. Look at that verse in the ASV.

" I would that they that unsettle you would even [c]go beyond circumcision."

And, in the ESV:

"I wish those who unsettle you would emasculate themselves!"

In the Greek it meant to mutilate themselves. In other words, Paul would rather the corrupting Judaizers had not only circumcised themselves, but had castrated themselves... cut it all off.

There is a very good analysis of Paul's letter to the Galatians, and this problem of today's Judaizers that are again teaching we have to keep the commandments of Moses' law. See here. It is a study in parts, one for each chapter.

Rom. 13:10,

"10 Love does no harm to a neighbor; therefore love is the fulfillment of the law." (NKJV)

Matt. 22:37-40,

"And Jesus said to him, `Thou shalt love the Lord thy God with all thy heart, and with all thy soul, and with all thine understanding --

38 this is a first and great command; 39 and the second [is] like to it, Thou shalt love thy neighbor as thyself;

40 on these -- the two commands -- all the law and the prophets do hang.'" (YLT)

We do not have to keep the Mosaic commandments. Christ fulfilled all of them with His death on the cross.