Neither be called instructors, for you have one instructor, the Christ.
Christ is repeated here as your sole Master because God alone must rule over us as Father, and Christ must subject all to His doctrine as disciples. This is the lawful order: the whole Church is His body, and the whole body must be subject to Him and obey Him.
AI summary
Ministers do guide souls to Christ, but only according to God's Word, not their own inventions, and only to enforce His authority, not their own. Men are so apt to set themselves up as masters in opposition to Him or above Him that this truth needed repeating: Christ alone is the one authoritative Master of the assemblies.
AI summary
These commands do not forbid proper civil titles or honor due to office. They forbid His disciples from seeking empty titles that produce distinction among themselves, imply authority to control others' opinions, and claim superiority over them.
AI summary