The Great Commandment (which we read in Mark 12:28-34) can be analysed in several ways:
Some will point out that the two parts each quote the Old Testament – Deuteronomy 6:5 and Leviticus 19:18, and ask with the scholars whether Jesus was the first teacher to bring them together in this way – it seems likely that it is.
Others will find it helpful to set this story in the sequence of questioning of Jesus after the Palm Sunday entry into Jerusalem. There is the parable of the Vineyard, the hostile questions about taxes, and the resurrection, and then this more friendly scribe.
I want to ask a more fundamental question: What does it mean to do it? What would loving God and neighbour in this way look like in today’s world? There is a single-mindedness about it – something we find difficult in a diverted and distracted world. Interestingly Mark (not Matthew and Luke, who deal with the story in different ways – perhaps reflecting different occasions when Jesus used the summary?) quotes Deuteronomy 6:4 “the Lord our God, the Lord is one” The force of that may be clearer in CEV “’People of Israel, you have only one Lord and God.” Because there is one God, and not a choice, a wholehearted response is necessary. This is most important – more than personal inclination, comfort, even wealth and career.
What then? Clearly we are put in our place, and it is not at the centre of the universe! That might offend our selfishness, but it can also be a relief. We do not have to invent a meaning to life, a reason for our existence or anything else – someone else has done that. If for a time we lose our way, and find it hard to see pleasure, let alone purpose, this is a personal malaise, not the end of the world! God knows, God plans, God is, and our responsibility is to him first. There is a relief in letting him be in charge!
Strangely, the second thing about being put in our place is that we are not free to disparage ourselves – or indeed other people. If we are made and loved by God, we are not unwanted, useless, or rubbish. We do not have to justify our existence by exceptional achievement.
I do not matter because I am clever, successful, or professionally competent – but because God made me, loves me, and saves me. That is true today, and will be tomorrow if I am suddenly confined to a wheelchair, unable to speak or do anything much at all.
You are not free to think badly of yourself – that can be a temptation, to be recognised as such. You are to love the Lord your God – and his evaluation of you, and of others.
Loving your neighbour is a consequence of this. Yes, you may have the worst possible set of neighbours, but God still cares for them. You may be the means of bringing them to faith, and so to heaven (which is about as important as anything could be!)
You don’t love your neighbour when you can find a nice one. You don’t love your neighbour to be thought well of, to be praised for your charity. You don’t love your neighbour to convince yourself that you aren’t such a bad person really. You love your neighbour because you know that God, who is the most important person in all the Universe, loves you and loves them as well. You are told to love them; it may even have a part in God’s plans for you both. So you do it.