‘Now that you have purified yourselves by obeying the truth so that you have sincere love for your brothers, love one another deeply, from the heart.’ This word deep is an awfully interesting Greek word. The more I studied it, I realized what it really means is to be stretched to the limit. It’s actually a distance-running word. It’s used to describe Jesus in the garden. You know, just about at the end of his tether. The word to love one another deeply really means to love one another strenuously. What does that mean?
It’s very much like running. One of the weird things about physical exercise is the more you do it, in general, the more strength you feel, but in the short run, you feel like you want to die. That’s what exercise is all about. It’s so odd that the very thing that gives you, overall, more energy, and more strength, and more power in the long run, in the short run drains you. Same thing with love. What the ironic thing is if you don’t drain yourself through exercise, the lack of exercise will drain you.
– Tim Keller
*Words found in Tim Keller’s 1993 Sermon, “Loving Deeply”