Shalom,

When Jesus was ministering on the earth, going about teaching, preaching and healing, He was asked by someone to tell them which of the commandments was the greatest. He replied:

Mark 12:29-31 (KJV)
29 And Jesus answered him, The first of all the commandments is, Hear, O Israel; The Lord our God is one Lord:30 And thou shalt love the Lord thy God with all thy heart, and with all thy soul, and with all thy mind, and with all thy strength: this is the first commandment.31 And the second is like, namely this, Thou shalt love thy neighbour as thyself. There is none other commandment greater than these.

The Amplified Bible says this:

Mark 12:29-31 (Amplified)
29Jesus answered, The first and principal one of all commands is: Hear, O Israel, The Lord our God is one Lord;
30And you shall love the Lord your God out of and with your whole heart and out of and with all your soul (your life) and out of and with all your mind (with your faculty of thought and your moral understanding) and out of and with all your strength. This is the first and principal commandment.
31The second is like it and is this, You shall love your neighbor as yourself. There is no other commandment greater than these.

Jesus said that the "first", the Greek word, protos, which means: foremost (in time, place, order of importance), best, chief, first in rank, influence or honor, the principal thing, "commandment", the Greek word, entole, which means: an injunction, an authoritative prescription, an order, is "Hear", which is the Greek word, akouo, which means: to give an audience to, to attend to, to consider what is or has been said, to understand, to perceive, to learn, to comprehend. What are we to learn, to pay attention to, to understand? That the Lord our God IS "Lord", the Greek word, kurios, which means: supreme in authority, Lord, Master, He to whom a person belongs, the Owner, the Sovereign One. We are to come to know that the Lord our God is "one" Lord, the Greek word, heis, which means: primary numeral. Our Lord is THE #1 Lord and besides Him, there is NO OTHER!

We also see here that it's not even enough for us to know these things about Him, but we must continue to obey the next verse! We must love the Lord (love is agape, the God-kind of love!) The same love that God loves us with, we are to love Him back with! And not just a little bit, either, but with our whole heart, soul, mind and strength! Just what does that mean? Well we can break it down briefly this way: Our heart is the spirit/soul combination. The Bible refers to the spirit of man as the "hidden man" of the heart (1 Peter 3:4). Our real self is a spirit being that, when we were born again, was recreated in the image of God. We have, or possess, our souls, our mind, emotions and will. Then He breaks it down even further by saying that we need to love the Lord with all of our "mind", the Greek word, dianoia, which means: deep thought, the mind, the imagination, the understanding. We are also told to love the Lord with all of our "strength", which is the Greek word, ischus, which means: force, ability, might, power. And THEN and ONLY THEN, can we do the rest of that commandment and love our neighbor, or fellow believer, as ourself!

It starts with the "ability" to make the choice to renew our "minds" with the Word of God, so that we can know and understand Who He is. When we renew our minds to think like the Word, then we'll be thinking like Jesus thinks! We will understand the great love that He has for us. When we really understand that love, it won't be hard for us to love Him back! THEN He wants us to "love Him forward" by loving other people in the same way that He loves us! That may seem hard now, but His love IN US, by the Holy Spirit Who lives in us, will do the work.

Just fall in love with Jesus everyday and meditate on His Word until it becomes real to YOU! Then you can be a doer of the Word and cause other people to see Jesus through you!

Shalom in Him!