On a duty to express our emotion
But you should not for that reason hold back your words anymore than you should hide visible emotion if it is genuine, because this can be the unloving committing of a wrong, just like withholding from someone what you owe him. Your friend, your beloved, your child, or whoever is the object of your love has a claim upon an expression of it also in words if it actually moves you inwardly. The emotion is not your possession but belongs to the other; the expression is your debt to him, since in the emotion you indeed belong to him who moves you and you become aware that you belong to him.
Søren Kierkegaard, Works of Love