What does it mean that love fulfills the law?

Paul says love is the fulfilling of the law. What law? The Mosaic―or the Christian―or any other specified and written laws? 

No, my friends, the law of Love is the law of God, the kind and benevolent feelings implanted in your heart by His Holy Spirit, coming direct from Him and returning to Him with added beauty as it manifests itself in you.

You are the recipient of this God-principle, the only difference is in degree―spirits can receive it more abundantly―

This holy and ennobling love, so constantly pouring out from the great Fountain of All Goodness, is freely bestowed on those who seek it aright―none are forbidden to take it in all its fullness and enjoy its blessed and comforting influences. Filled with this love, you feel in harmony with all persons, circumstances, trials, contentions, sorrows, cannot move you to contend or despond―you are impervious to the darts of the wicked―or to the attacks of the malicious.

You may say I have never felt this love―I am depressed by this thing―cast down by that―troubles and doubts overwhelm me―I even debate within myself whether I am better or worse for my knowledge of spiritual things.

My friends, doubts would not arise if you had sought these things out in the right way―if you had taken hold of the matter by the roots in your own heart and cultivated there this true love-principle, examined yourself thoroughly, ascertained faithfully if there were any shortcomings in your own actions that might prevent for a time its entrance as an inmate of your bosom.

If you are in harmony with yourself, everything appears bright and lovely to you―you can sympathise with the mirthful―or you can comfort the afflicted from your own harmonious standpoint―

You are so filled with this feeling of peace and joy that you seem to tread on air―nothing disturbs your equanimity and you want everyone you come in contact with to feel as happy as you do yourself.

―J. W. In Spirit