What is the difference between "Loving" and "Calculation"?
If you know the difference between "seeing" and "feeling", then, you'll know "loving" and "calculation".
To love is not to calculate. If you need calculation, you need not love.
People who can calculate can easily win a battle, but not a lover. Those are non-loving creatures.
By calculation, you can point a missile into a house. But the eventual target of that missile, is yourself.