For this also is the glory of a Master, to have grateful slaves. And this is the glory of a Master, that He should thus love His slaves. And this is the glory of a Master, to claim for His own what is theirs. And this is the glory of a Master, not to be ashamed to confess them before all. Let us therefore be stricken with awe at this so great love of Christ. Let us be inflamed with this love-potion. Though a man be low and mean, yet if we hear that he loves us, we are above all things warmed with love towards him, and honor him exceedingly.
And do we then love? And when our Master loves us so much, we are not excited? Let us not, I beseech you, let us not be so indifferent with regard to the salvation of our souls, but let us love Him according to our power, and let us spend all upon His love, our life, our riches, our glory, everything, with delight, with joy, with alacrity, not as rendering anything to Him, but to ourselves. For such is the law of those who love. They think that they are receiving favors, when they are suffering wrong for the sake of their beloved. Therefore let us be so affected towards our Lord, that we also may partake of the good things to come in Christ Jesus our Lord.
Source: Homilies on Philemon (New Advent)