John wrote a letter to a chosen lady and her children who were members of a church where the lady worked. He greeted them with grace, mercy and peace from God and Jesus Christ. John warned of two dangers: 1) not remaining in love by keeping God's commandments, and 2) deceivers who do not acknowledge Jesus and stray from his teachings. He advised to not welcome or associate with false teachers, in order to avoid being corrupted and give such teachers a chance to repent. John hoped to discuss more with them face to face for their mutual joy.