Contradiction with 1 Corinthians 15:58
1 Corinthians 15:58 encourages believers to be steadfast and immovable, always abounding in the work of the Lord, indicating that their labor is not in vain, whereas 2 John 1:8 warns about losing what has been worked for, suggesting a potential loss despite efforts.
1 Corinthians 15:58: Therefore, my beloved brethren, be ye stedfast, unmoveable, always abounding in the work of the Lord, forasmuch as ye know that your labour is not in vain in the Lord.
Contradiction with Galatians 6:9
Galatians 6:9 encourages perseverance by assuring that if we do not give up, we will reap a harvest in due time, which contrasts with 2 John 1:8's warning about losing what we have worked for, indicating a possibility where perseverance might not guarantee reward.
Galatians 6:9: And let us not be weary in well doing: for in due season we shall reap, if we faint not.
Contradiction with Philippians 1:6
Philippians 1:6 expresses confidence that God, who began a good work in believers, will carry it on to completion, which contrasts with 2 John 1:8 indicating a precaution against losing achievements.
Philippians 1:6: Being confident of this very thing, that he which hath begun a good work in you will perform [it] until the day of Jesus Christ: [perform: or, finish]