Contradiction with Matthew 6:34
Encourages not to worry about tomorrow, whereas Ecclesiastes 12:1 advises remembrance of one's creator in youth, implying preparation for the future.
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 James 4:13-14
Warns about making future plans because life is uncertain, contrasting with Ecclesiastes 12:1's emphasis on remembering the creator during youth.
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 Luke 12:19-20
Speaks against storing up for the future as life is unpredictable and contrasts with Ecclesiastes 12:1's advice on early remembrance and preparation.
Luke 12:19-20: And I will say to my soul, Soul, thou hast much goods laid up for many years; take thine ease, eat, drink, [and] be merry.
Contradiction with Proverbs 27:1
Advises against boasting about tomorrow since future is uncertain, conflicting with the proactive remembrance encouraged in Ecclesiastes 12:1.
Proverbs 27:1: Boast not thyself of to morrow; for thou knowest not what a day may bring forth. [to...: Heb. to morrow day]