The abstract principle behind marriage is a life-long commitment to share oneself with a loved one. But abstract principles are just that -- “abstract” -- while people are real. How can you say you favor justice for gays and lesbians while advocating discrimination against them in law? It’s a contradiction to favor the practice but oppose the principle. “Anyone who does not love his brother, whom he has seen, cannot love God, whom he has not seen” (I Jn. 4:20).