John Chrysostom — as excerpted in the Catena Aurea on John 14:15-17

“Our Lord having said, Whatsoever ye shall ask in My name, that I will do; that they might not think simply asking would be enough, He adds, If ye love Me, keep My commandments. And then I will do what ye ask, seems to be His meaning. Or the disciples having heard Him say, I go to the Father, and being troubled at the thought of it, He says, To love Me, is not to be troubled, but to keep My commandments: this is love, to obey and believe in Him who is loved. And as they had been expressing a strong desire for His bodily presence, He assures them that His absence will be supplied to them in another way: And I will pray the Father, and He will give you another Comforter.”