Perhaps all the questions we ask of love, to measure, test, probe, and save it, have the additional effect of cutting it short. Perhaps the reason we are unable to love is that we yearn to be loved, that is, we demand something (love) from our partner instead of delivering ourselves up to him demand-free and asking for nothing but his company.
The Unbearable Lightness of Being, Milan Kundera.  With a daily two-hour round trip commute I plan to fly through my to-read list.  Kundera’s classic ranks a 4.5 on a scale of 1-10 though.