Contradiction with Matthew 6:7
This verse advises against using vain repetitions in prayer, whereas Colossians 4:2 encourages continuing in prayer without explicitly addressing the manner of prayer repetition.
Matthew 6:7: But when ye pray, use not vain repetitions, as the heathen [do]: for they think that they shall be heard for their much speaking.
Contradiction with Ecclesiastes 5:2
This verse advises against being rash with words in prayer, suggesting a careful approach that could be seen as conflicting with a continuous prayer approach.
Ecclesiastes 5:2: Be not rash with thy mouth, and let not thine heart be hasty to utter [any] thing before God: for God [is] in heaven, and thou upon earth: therefore let thy words be few. [thing: or, word]
Contradiction with 1 Thessalonians 5:17
Although not a direct contradiction, this verse's instruction to "pray without ceasing" might seem at odds with being watchful in prayer, as constant prayer might not always allow for vigilance.
1 Thessalonians 5:17: Pray without ceasing.
Contradiction with Isaiah 1:15
This verse indicates that God may not always listen to prayers if they are insincere, which can be seen as contradictory to the encouragement in Colossians 4:2 to persevere in prayer.
Isaiah 1:15: And when ye spread forth your hands, I will hide mine eyes from you: yea, when ye make many prayers, I will not hear: your hands are full of blood. [make...: Heb. multiply prayer] [blood: Heb. bloods]