Contradiction with Proverbs 27:1
Contradicts by advising not to boast about tomorrow, conflicting with Paul's urgency in Timothy's travel plans.
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
Contradicts by warning against planning for the future without acknowledging uncertainty.
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
Contradicts by advising not to worry about tomorrow, contrary to the urgency conveyed in 2 Timothy 4:21.
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.
Contradiction with Ecclesiastes 9:11
Contradicts by emphasizing unpredictability of events, while 2 Timothy 4:21 assumes a certain outcome.
Ecclesiastes 9:11: I returned, and saw under the sun, that the race [is] not to the swift, nor the battle to the strong, neither yet bread to the wise, nor yet riches to men of understanding, nor yet favour to men of skill; but time and chance happeneth to them all.
Contradiction with Proverbs 16:9
Contradicts by suggesting that humans plan their course but God determines steps, conflicting with travel plans made in 2 Timothy 4:21.
Proverbs 16:9: A man's heart deviseth his way: but the LORD directeth his steps.