From A Course in Miracles :
The special love relationship is the ego’s most boasted gift, and one which has the most appeal to those unwilling to relinquish guilt . The “ dynamics “ of the ego are clearest here, for counting on the attraction of this offering, the fantasies that centre around it are quite often overt . Here they are usually judged to be acceptable and even natural . No one considers it bizarre to love and hate together, and even those who believe that hate is sin merely feel guilty, but do not correct it . This is the “ natural “ condition of the separation, and those who learn that it is not natural at all seem to be the most unnatural ones . For this world is the opposite of Heaven, being made to be its opposite of what is true . In Heaven, where the meaning of love is known, love is the same as union . Here, where the illusion of love is accepted in love’s place, love is perceived as separation and exclusion .
It is in the special relationship, born of the hidden wish for special love from God, that the ego’s hatred triumphs . For the special relationship is the renunciation of the Love of God, and the attempt to secure for the self the specialness that He denied . It is essential to the preservation of the ego that you believe this specialness is not hell but Heaven . For the ego would never have you see that separation could only be loss, being the one condition in which Heaven could not be .