I am reposting the content of this passage, which I have posted before, but am leaving out the discussion in the comments, which reflected some of the more acrimonious phases of the controversy with Calvinists I engaged in several months back.
The value of free will does not end there. All sorts of relationships acquire special value because they involve love, trust, and affection are freely bestowed. The love potions that appear in many fairy stories (and the Harry Potter series) can become a trap; the one who has used the potion finds that he wants to be loved for his own sake and not because of the potion, yet fears the loss of the beloved’s affection if the potion is no longer used. For that matter, individuals without free will would not, in the true sense, be human beings at all, at least this is the case as seems highly plausible, the capacity for free choice is an essential characteristic of human beings as such. If so, then to say that free will should not exist is to say that we humans should not exist. It may be possible to say that, and perhaps even mean it, but the cost of doing so is very high. William