To every thing there is a season, and a time to every purpose under the heaven:
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Ecclesiastes 3:1-3
Tyndale Open Study Notes (CC BY-SA 4.0).
3:1-8 For everything there is a season, a time for every activity under heaven: Wisdom recognizes that everything has its own season—in human activities as in the realm of nature (see 1:3-7). A wise person will determine the appropriate time to pursue any activity (8:5). The opportunity is fleeting (Eph 5:16; Col 4:5).
Other Bible passages linked to this one, most cited first.
I said in mine heart, God shall judge the righteous and the wicked: for there is a time there for every purpose and for every work.
And in the morning, It will be foul weather to day: for the sky is red and lowring. O ye hypocrites, ye can discern the face of the sky; but can ye not discern the signs of the times?
Whoso keepeth the commandment shall feel no evil thing: and a wise man’s heart discerneth both time and judgment. Because to every purpose there is time and judgment, therefore the misery of man is great upon him.
In the day of prosperity be joyful, but in the day of adversity consider: God also hath set the one over against the other, to the end that man should find nothing after him.
And he said unto him, Went not mine heart with thee, when the man turned again from his chariot to meet thee? Is it a time to receive money, and to receive garments, and oliveyards, and vineyards, and sheep, and oxen, and menservants, and maidservants?
A man hath joy by the answer of his mouth: and a word spoken in due season, how good is it!
Authorship: the book itself or Christian tradition. Approximate dates, as in Carson and Moo, An Introduction to the New Testament, and Longman and Dillard, An Introduction to the Old Testament.