You shall love.
"Only when it is a duty to love, only then is love eternally secured against every change, eternally made free in blessed independence, eternally and happily secured against despair. However joyous, however happy, however indescribably confident instinctive and inclinational love, spontaneous love, can be in itself, it still feels precisely in its most beautiful moment the need to establish itself, if possible, more securely." -Works of Love. Søren Kierkegaard.