Contradiction with Matthew 6:34
Encourages not to worry about the future, contrasting the notion of planning which is implied in Luke 14:29.
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 Proverbs 27:1
Advises against boasting about tomorrow, suggesting the uncertain nature of the future, unlike the preparation implied in Luke 14:29.
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
Warns against making plans without considering God's will, contrasting the planning metaphor in Luke 14:29.
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: