Tell any six-year-old child that she should do something "because" and odds are you'll get a response of "Because why?" Hey, tell this thirty-year-old woman, and odds are that even though I've learned to hold it back a little better, my brain still flashes to that question, too.
Why should I bother loving people? They betray me. They ignore me. Sometimes they just irritate me. "As loving as I can" could easily mean "as much as I can be reasonably expected to put up with somebody like this," right?
As often as I can? That makes it better. Because there are days I don't get a lot of sleep, or I have piles of stuff on my desk, or I'm running late, and it's hard to love people on those days, hard to love people who don't answer my emails or who are not driving with any sense of urgency. But if I only love people as often as I can, that excludes days like that.
For as many people as I can...now that takes care of the part where sometimes I run across people I don't like. Sweet. So now the Bible has made it clear that I should love the people I'm naturally inclined to as much as I feel up to whenever I feel like it. I can handle that.
Uncomfortably, the Bible makes it clearer than Braestrup says on...
...who we should love:
"You shall love the Lord your God with all your heart and with all your soul and with all your might." (Deuteronomy 6:5)
"Love your neighbor as yourself." (Leviticus 19:18b)
"If someone says, 'I love God,' and hates his brother, he is a liar; for the one who does not love his brother whom he has seen, cannot love God whom he has not seen." (I John 4:20a)
"Love the sojourner, therefore, for you were sojourners in the land of Egypt." (Deuteronomy 10:19)
"But I say to you who hear, love your enemies, do good to those who hate you, bless those who curse you, pray for those who mistreat you." (Luke 6:26-28)
...when we should love:
"A friend loves at all times, and a brother is born for adversity." (Proverbs 17:17)
...how we should love:
"Love is patient, love is kind and is not jealous; love does not brag and is not arrogant, does not act unbecomingly; it does not seek its own, is not provoked, does not take into account a wrong suffered, does not rejoice in unrighteousness, but rejoices with the truth; bears all things, believes all things, hopes all things, endures all things." (I Corinthians 13:4-7)
And those passages are just from the highlight reel.
God asks a lot more from us than our best effort. He asks for perfection. (Loving at all times? Bearing all things? Enduring all things?) He also sent perfection, in the person of Jesus Christ: "In this is love, not that we loved God, but that He loved us and sent His Son to be the propitiation for our sins." (I John 4:10)
And He sent a promise: "Whoever confesses that Jesus is the Son of God, God abides in him, and he in God. We have come to know and have believed the love which God has for us. God is love, and the one who abides in love abides in God, and God abides in him. By this, love is perfected with us, so that we may have confidence in the day of judgment; because as He is, so also are we in this world." (I John 4:15-17)
And He sent a because: "We love, because He first loved us." (I John 4:19)