Charity simply means Christian love. It is the greatest of the theological virtues. Charity does not simply involve feelings. Essentially, it involves the will.
Loving God and loving others involves our will and not merely our feelings. Even if the person is not “lovable” or “likable”, we must act as if he is, and we will discover that we will actually learn to like and love him. Similarly, even if our feelings toward God may be cold, we must act as if we are sure we love Him, and we will find that our affection toward Him will actually grow and deepen.