…One of them, an expert in the law, tested him with this question: “Teacher, which is the greatest commandment in the Law?”
Jesus replied: “ ‘Love the Lord your God with all your heart and with all your soul and with all your mind.’ This is the first and greatest commandment. And the second is like it: ‘Love your neighbor as yourself.’ All the Law and the Prophets hang on these two commandments.” –Matthew 22
In my lifetime, I have been blessed to hear or learn under several noted Christian teachers. The one lesson, which has made the most difference, is centered on the word “and.” D. Elton Trueblood called this “the holy conjunction.” He emphasized this in key areas like Christ’s humanity and divinity; roots and fruits; the inner life of devotion and the outer life of service.
From the beginning of the Church, there were always those who failed in the struggle to hold these key essentials together. We see this in John’s first epistle. The church to which he wrote had divided. Under the strong influence of the spirit of the times, some Christians rejected the idea that the Messiah came in flesh and blood. They saw the world through dualistic lenses: In its essence, matter (e.g. flesh; that which is created) was evil; spirit was good.
One such contemporary of John’s was Cerinthus who distinguished between Jesus, the man of flesh and blood, and the Christ, the spiritual being who, he claimed, descended upon Jesus at his baptism and departed before the crucifixion. Cerinthus’ dualistic view did not allow suffering for spiritual beings….
When Jesus was asked which was the foremost commandment, he replied, “You shall love the LORD your God with all your heart, with all your soul, and with all your mind.”
“…And the second is like it: ‘You shall love your neighbor as yourself’”(Matt. 22:37, 39).
Again, we have the holy conjunction–“and.” To claim to love God but to not love our neighbor, or to try to get around Jesus description of a neighbor as illustrated in the parable of the Good Samaritan, is to enter into a sort of heresy.
First John states it thus: “He who says, ‘I know him’ and does not keep his commandments is a liar and the truth is not in him…
“He who says he is in the light [divine], and hates his brother [flesh], is in the darkness until now” (2:4, 9). (Keep in mind the dualistic view of those like Cerinthus.)
Love of God and love of neighbor make up the whole counsel of God, so that Jesus said, “On these two commandments hang all the Law and the Prophets” (Matt. 22:40).
We need to keep alert here and heed a warning: while “and” holds together different aspects within Christian teaching, we need to beware that it can become the “unholy conjunction” when we try to combine Christian and non-Christian worldviews. C. S. Lewis illustrated this through the mouth of his diabolical character, Screwtape. In Letter XXV to his underling demon, Screwtape advises Wormwood about his strategy which he has devised against Christians:
What we want, if men become Christians at all, is to keep them in the state of mind I call “Christianity And.” You know—Christianity and the Crisis, Christianity and the New Psychology, Christianity and the New Order, Christianity and Faith Healing, Christianity and Psychical Research, Christianity and Vegetarianism, Christianity and Spelling Reform. If they must Be Christians, let them at least be Christians with a difference. Substitute for the faith itself some Fashion with a Christian colouring. Work on their horror of the Same Old Thing.
The horror of the Same Old Thing is one of the most valuable passions we have produced in the human heart—an endless source of heresies.2
From Introduction to Love, Prayer, and Forgiveness: When Basics Become Heresies