6. If we love a person, we are jealous about their name.
We do not like to hear them spoken against, without speaking up for them and defending them. We feel bound to maintain their interests and their reputation. We regard the person who treats them ill with almost as much disfavor as if they had ill–treated us. Well, it is just so between the true Christian and Christ! The true Christian regards with a godly jealousy all efforts to disparage their Master’s word, or name, or church, or day. They will confess Him before princes, if need be, and be sensitive of the least dishonor put upon Him. They will not hold their peace, and suffer their Master’s cause to be put to shame, without testifying against it. And why is all this? Simply because they love Him.
~ J.C. Ryle Holiness: Its Nature, Hindrances, Difficulties, and Roots, “Do You Love Me?”, [Moscow, ID: Charles Nolan Publishing, 2001], 294-297.