The mind defines, decides, doubts and divides - only the heart truly binds.
I am not sure that you can be taught how to love. In many ways it is innate - just watch and see what small child effortlessly does. But you can be invited to it and reminded of it.
If I do not love my fellow man, I can be sure of it that I do not love Jesus Christ. And I would do well if guilty of loving Jesus Christ even more than I love my fellow man, because only by this may...