The two great commandments: Love God, love your neighbor. The lawyer who was questioning Jesus accurately stated the teaching of Torah, the law of the people of Israel. Any child could have given the same answer. The devil was in the details. What does love of God look like? How am I to love my neighbor? How much? How often? To what degree?

And, in the end, Who counts as my neighbor?
That was what the lawyer wanted to know. Define who my neighbor is and I will then go about 'loving' that person and thus fulfill my obligation to God. [parable of the Good Samaritan Luke 10]
Now, I am glad he was concerned about being in right relationship with God. I don't think it is either fair or accurate to assume he was attempting to minimize the challenge of his commitment to following God nor to assign nefarious intent in his request for precision. Not that there weren't darker intentions lurking behind all the questions: we all have darker intentions, we all are looking for a way to ease our conscience, we all sin. So let's not beat up on the lawyer. He wanted to get it right.
But of course, you can't get the neighbor thing right if you don't get the 'love' part right, and love can be a slippery thing. Love is a very deep well. It is both cotton candy (very sweet, floating all over the place and sticking to everything) and as strong as steel. Usually there are shared values, regard for the other's welfare, and a commitment to each other that defies outside forces. It's about trust, respect and sacrifice. Love is that which remains when all that is ephemeral disappears. It is the hot core at the center of it all.
So, I think that we have a major problem before we even get to the neighbor question. The demands of love are enormous and, truthfully, we don't act with love continually. Sometimes the sacrifice that love demands is far greater than we are able or willing to give. Yet, even as we cry out "I just can't!" we turn again and seek to 'love' again, giving it one more try. Humans are inconsistent lovers.
Given the difficulty of love (whether it be God or neighbor) we move on to the difficulty of 'neighbor.' Somehow we can convince ourselves that we 'love' God - deeply, consistently, with honesty. This is easier because we don't run into God when we go to the market or pump our gas. We don't have to talk to God before we have our morning coffee or at the water cooler at work (that isn't true, but that's a discussion for another day.) Neighbors, however, are a much different subject. We might love neighbors in the abstract, but people in the flesh are much harder to take. With or without our morning coffee.
I understand the lawyer's desire to figure out who he is obligated to love as his neighbor. Otherwise this whole 'love' thing could get out of hand; he needs some boundaries. Who then is my neighbor?
It's one of those questions that if you have to ask, you don't understand what you are talking about.
And of course he doesn't understand what he is asking because we all live in a quid pro quo world and Jesus is talking about God's coming kingdom. We live in a world where looking out for yourself, your family and then your friends is our primary focus and often more than we can handle. We seek our advantage because, frankly, no one else will. We separate some folks because we have about as much as we can handle here. The demands of providing are killing us now; we cannot be asked to provide for every other human being we encounter.
And he is right, of course. We can't feed all the hungry or clothe all the teenagers or hire all the unemployed or find housing for all the homeless. We can't do it all. All of this 'loving' is killing us; there have to be limits.
Or maybe, it is all this 'not loving' that is killing us. Maybe if there was a little more love in our relationships that man wouldn't have ended up in the ditch. Perhaps he is left as good as dead because 'loving our neighbor' isn't a guiding principle for everyone. We get another reminder of this as two - two! - apparently religious men see his plight and avoid responsibility by passing by on the other side - as far away from this 'neighbor' as they can get.
So now we are ready to hear how Jesus thinks about this, how God looks at this, and how God's heart responds to this Child of God lying in the mud by the road.
Be prepared for some sacrifice here.