From the King James Version, in Mark 12:29-31, Jesus says:
The first of all the commandments is, Hear, O Israel; The Lord our God is one Lord: 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.And the second is like, namely this, Thou shalt love thy neighbour as thyself.
In Luke 10:27 this quotation appears again, but is immediately followed by the Good Samaritan story, demonstrating that mankind is commanded to care for one another.
It follows that if we love God like we are supposed to, and also one another, the other things will fall into place. But without this love, we will not be able to develop as spiritual beings. This also implies that love is something we decide to do, not just fall into. It is a conscious decision, not a hormone-driven physical reaction.
The English teacher in me can’t help but note that in verse 30 above, Jesus is actually using two rhetorical strategies. Repetition occurs with the words “with all thy” four times. And by expressing each of these four ideas in a similar way (in terms of the arrangement of the words) in such a short space, he is creating parallel structure.