Theophylact of Ohrid — as excerpted in the Catena Aurea on John 14:18-21

“As if He said, Ye think that by sorrowing, as ye do, for my death ye prove your affection; but I esteem the keeping of My commandments the evidence of love. And then He shews the privileged state of one who loves: And he that loveth Me shall be loved of My Father, and I will love him.”