Ecclesiastes is the Bible's fun book because it's chock full of normal thinking instead of religious dogma. Ecclesiastes requires very little interpretation as anybody who's been around the block a time or two can easily relate to its thoughts.
Bible students are often baffled as to why Solomon's remarks in the book of Ecclesiastes sometimes contradict Christ's teachings in the New Testament. Well; the answer to that is actually pretty simple.
Solomon wasn't inspired to record his observations of life from the perspective of an enlightened man who's privy to knowledge beyond the scope of empirical evidence and human experience; rather, from the perspective of a man under the sun; viz: a down to earth thinking man whose perception of reality is moderated by what he can see for himself going on around him in the physical universe; which of course results in an evaluation of life on earth as seen from the earth rather than an evaluation of life on earth as seen from heaven.
In other words: Ecclesiastes isn't the word of God, it's the word of a philosopher; his own personal world view, and it's so identified right at the gun. (Ecc 1:1)
Solomon was the brightest intellectual of his day. However; it is not wise to interpret Christ's teachings by citing Solomon's because according to Matt 12:42, Luke 11:31, John 1:1 and Col 2:3; Jesus' wisdom is superior to Solomon's, and has more authority.
In addition: Jesus Christ spoke the words of God (John 3:34, John 8:26, John 8:28, John 12:49, John 14:24) whereas there is not the slightest textual evidence in the book of Ecclesiastes that Solomon spoke the words of God when he wrote it. Caveat Lector.
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