To every purpose there is time - חפץ chaphets, every volition, every thing that depends on the will of man. He has generally the opportunity to do whatever he purposes; and as his purposes are frequently evil, his acts are so too: and in consequence his misery is great.

to every

Ecclesiastes 3:1,11,17 To every thing there is a season, and a time to every purpose under the heaven...

Ecclesiastes 7:13,14 Consider the work of God: for who can make that straight, which he has made crooked...

therefore

Ecclesiastes 11:9,10 Rejoice, O young man, in your youth; and let your heart cheer you in the days of your youth, and walk in the ways of your heart...

Ecclesiastes 12:1 Remember now your Creator in the days of your youth, while the evil days come not, nor the years draw near, when you shall say...

Isaiah 3:11-14 Woe to the wicked! it shall be ill with him: for the reward of his hands shall be given him...

Isaiah 22:12-14 And in that day did the Lord GOD of hosts call to weeping, and to mourning, and to baldness, and to girding with sackcloth...

Luke 13:25 When once the master of the house is risen up, and has shut to the door, and you begin to stand without, and to knock at the door...

Luke 17:26-30 And as it was in the days of Noe, so shall it be also in the days of the Son of man...

Luke 19:42-44 Saying, If you had known, even you, at least in this your day...

Hebrews 3:7-11 Why (as the Holy Ghost said, To day if you will hear his voice...

Whether Christ Should have Been Circumcised?
Objection 1: It would seem that Christ should not have been circumcised. For on the advent of the reality, the figure ceases. But circumcision was prescribed to Abraham as a sign of the covenant concerning his posterity, as may be seen from Gn. 17. Now this covenant was fulfilled in Christ's birth. Therefore circumcision should have ceased at once. Objection 2: Further, "every action of Christ is a lesson to us" [*Innoc. III, Serm. xxii de Temp.]; wherefore it is written (Jn. 3:15): "I have given …
Saint Thomas Aquinas—Summa Theologica

Ecclesiastes
It is not surprising that the book of Ecclesiastes had a struggle to maintain its place in the canon, and it was probably only its reputed Solomonic authorship and the last two verses of the book that permanently secured its position at the synod of Jamnia in 90 A.D. The Jewish scholars of the first century A.D. were struck by the manner in which it contradicted itself: e.g., "I praised the dead more than the living," iv. 2, "A living dog is better than a dead lion," ix. 4; but they were still more …
John Edgar McFadyen—Introduction to the Old Testament