John 14:15

If ye love me, keep my commandments - Do not be afflicted at the thought of my being separated from you: the most solid proof ye can give of your attachment to and affection for me is to keep my commandments. This I shall receive as a greater proof of your affection than your tears.

If ye love me - Do not show your love by grief at my departure merely; or by profession, but by obedience.

Keep my commandments - This is the only proper evidence of love to Jesus, for mere profession is no proof of love; but that love for him which leads us to do all his will, to love each other, to deny ourselves, to take up our cross, and to follow him through evil report and through good report, is true attachment. The evidence which we have that a child loves its parents is when that child is willing, without hesitation, gainsaying, or complaining, to do all that the parent requires him to do. So the disciples of Christ are required to show that they are attached to him supremely by yielding to all his requirements, and by patiently doing his will in the face of ridicule and opposition, 1 John 5:2-3.

14:15 If ye love me, keep my commandments - Immediately after faith he exhorts to love and good works.