You are quoting Mat 22:37, which is a quote by Jesus of the Shema (Deut 6:4-8). Any Jew, certainly the Pharisees, understood this. It is the very basis of Judaism.. of the Torah. The part you quote cannot stand alone without the rest. As a matter of fact, the whole reason of Jesus' discourse is muted if it is not included. He sought to show that Israel's belief in ONE God with all the heart, mind, etc.. was only valid in tandem with right treatment of their fellow man.
Furthermore this account in Matthew is paralleled in Mark 12:28-30...
28 And one of the scribes came, and having heard them reasoning together, and perceiving that he had answered them well, asked him, Which is the first commandment of all?
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.
It is the same instance as recorded by another writer. In any case, it is the same passage of scripture. To leave off the First part skews the meaning and intent, period.
Okay, I will admit to omitting it by accident. It was just chance that I chose Matthew's account. But in my life, there is one God. And the English Bible begins: "In the beginning, God....." I know what comes after, but that part is the foundation of my philosphy of life. I look forward to seeing the God of Abraham, Isaac, and Jacob and to seeing the unbelieving stares of those who don't believe I have a chance at that because I follow the Way. One Jew, when asked what he would do if Messiah came today, said he would respectfully ask, "Sir is this your first visit or your second?" I believe it would be the second, but then I am just one of the wild branches grafted in.