If you love, you will unconsciously fulfil the whole law. And you can readily see for yourselves how that must be so. Take any of the commandments. Thou shalt have no other gods before Me. If a man love God, you will not require to tell him that.
Love is the fulfilling of that law.
Take not His name in vain. Love would fulfil all these laws regarding God. And so, if he loved Man, you would never think of telling him to honour his father and mother. He could not do anything else. It would be preposterous to tell him not to kill.