Matthew: Chapter 22: 34-40. But when the Pharisees had heard that he had put the Sadducees to silence, they were gathered together. Then one of them, which was a lawyer, asked him a question, tempting him, and saying, Master, which is the great commandment in the law? Jesus said unto him, Thou shalt love the Lord thy God with all thy heart, and with all thy soul, and with all thy mind. This is the first and great commandment. And the second is like unto it, Thou shalt love thy neighbour as thyself. On these two commandments hang all the law and the prophets.
There is no doubt that The Bible, including the Old Testament Ten Commandments and the Gospels, commands us to Love God as the first, greatest and most important thing we must do...
But how is this possible? How may love be commanded?
The apparent problem is that we assume Love is a feeling, and a feeling cannot be manufactured; but even if it could, what would be the good of manufacturing a feeling of Love for God?
My understanding is that the The First and Great Commandment is about metaphysics, not feelings; it is about our first principles as a Christian, our most basic assumptions concerning how things truly are, how reality works.
Therefore, we are being told that everything in the Christian life 'hangs' on our assumption that God loves us. That is why God made everything, why God made this earth, why God made men and women, why we are incarnated and placed in mortal lives, and why we experience all the things we experience including death. All this is because God loves us.
It implies also the the nature of God is such that he loves - however we envisage God, we must represent the deity in a way compatible with love being God's primary characteristic.
How we may do this is set-out: because the most frequent term for God in the Gospels is 'Father'; and we are described as Sons and Daughters of God.
In sum, the Christian must interpret life and the world in this way - as a product of God's love. And this is non-negotiable - it is not put forward as a proposition to be tested by experience or reason; it is a metaphysical assumption.
If we ever interpret anything as contradictory to the fact and assumption of God loving us; we are definitely making a mistake.
But how can each of us, personally, reach such an assumption? Well, how did we, as (let's assume) a child of a real life loving Father and Mother, reach a similar assumption about our parents? Not from evidence, clearly - not from some kind of balance-sheet.
Such convictions come from direct, intuitive knowing - beyond the senses, beyond logic, beyond measurement. And that this direct form of intuitive knowledge is valid, is therefore required by Christianity.
If you want to be a Christian, you must know that God loves us; and know it in the same kind of way that you know your Father and Mother love you. And live life on that basis. That is the first and great commandment.
And you must find this out by introspection, by intuition; you must just-know-it above and beyond and behind all other things you know; this solid assumption framing and interpreting all other things you know.
And that this direct knowing of God's love is possible and valid and achievable is also implied by the first and great commandment.