Some indeed have come very close to it. That resilient Jew, Paul of Tarsus, gave it a good try. Francis of Assisi went a long way. The famous Mahatma Ghandi of India practised the teaching with powerful effect. Let s start with the fact that as Christians we do live by grace, not law.
Grace is always the bottom line.
We constantly need the renovating mercy of God. When we depend on grace, the teaching of Jesus is not an added burden but a lure towards the authentic future. Loving means truly seeking the best for them. Such love is not mere idealism. It is practical.