Contradiction with Proverbs 27:1
This verse advises not to boast about tomorrow, contradicting the goodbye in 3 John 1:14 which suggests a future meeting.
Proverbs 27:1: Boast not thyself of to morrow; for thou knowest not what a day may bring forth. [to...: Heb. to morrow day]
Contradiction with James 4:13-14
These verses warn against making future plans without acknowledging God's will, contradicting the planned future meeting in 3 John 1:14.
James 4:13-14: Go to now, ye that say, To day or to morrow we will go into such a city, and continue there a year, and buy and sell, and get gain:
Contradiction with Matthew 6:34
This verse advises against worrying about tomorrow, contradicting the farewell anticipations for future interaction in 3 John 1:14.
Matthew 6:34: Take therefore no thought for the morrow: for the morrow shall take thought for the things of itself. Sufficient unto the day [is] the evil thereof.