I must have a different translation of the New Testament than you do. My St. Joseph version reads "You shall love the Lord your God with all your heart, with all your soul, with all your mind, and with all your strength. The second is this 'You shall love your neighbor as yourself.' There is no other commandment greater than these." (Mk. 12:30-31) Which version do you use that has Christ allowing certain conditions on these commandments and permitting exceptions?