Sorrow for sin arising from perfect love. In perfect contrition the sinner detests sin more than any other evil, because it offends God, who is supremely good and deserving of all human love. Its motive is founded on God's own personal goodness and not merely his goodness to the sinner or to humanity. This motive, not the intensity of the act and less still the feelings experienced, is what essentially constitutes perfect sorrow. A perfect love of God, which motivates perfect contrition, does not necessarily exclude attachment to venial sin. Venial sin conflicts with a high degree of perfect love of God, but not with the substance of that love. Moreover, in the act of perfect contrition other motives can coexist with the perfect love required. There can be fear or gratitude, or even lesser motives such as self-respect and self-interest, along with the dominant reason for sorrow, which is love for God. Perfect contrition removes the guilt and eternal punishment due to grave sin, even before sacramental absolution. However, a Catholic is obliged to confess his or her grave sins at the earliest opportunity and may not, in norma circumstances, receive Communion before he or she has been absolved by a priest in the sacrament of penance.