Life is full of physical infirmities that some might see as discriminations - total paralysis or serious mental impairment being two that are relevant to marriage. If we believe in God and believe in His mercy and His justice, it won't do to say that these are discriminations because God wouldn't discriminate. We are in no condition to judge what discrimination is. We rest on our faith in God and our utmost assurance of His mercy and His love for all of His children.