Contradiction with Proverbs 17:28
Ecclesiastes 5:3 suggests that a fool's voice is known through many words, while Proverbs 17:28 suggests that even a fool is considered wise when he holds his peace.
Proverbs 17:28: Even a fool, when he holdeth his peace, is counted wise: [and] he that shutteth his lips [is esteemed] a man of understanding.
Contradiction with James 1:19
Ecclesiastes 5:3 implies that speaking too much reveals folly, whereas James 1:19 advises everyone to be swift to hear and slow to speak, suggesting wisdom in restraint, not in the amount of words.
James 1:19: Wherefore, my beloved brethren, let every man be swift to hear, slow to speak, slow to wrath:
Contradiction with Proverbs 10:19
Ecclesiastes 5:3 indicates a fool's voice is heard with many words, whereas Proverbs 10:19 acknowledges that in the multitude of words there is sin, implying a cautious approach to speech.
Proverbs 10:19: In the multitude of words there wanteth not sin: but he that refraineth his lips [is] wise.
Paradox #1
Ecclesiastes 5:3 talks about dreams coming from too much activity and foolish talk from too many words. The moral conflict here might be that while the verse suggests caution against overindulgence in dreams and words, other parts of the Bible encourage dreaming big and speaking boldly about one's faith. This could seem inconsistent if one is urged to both dream and speak freely, yet also be warned against doing them excessively.