They teach us that all things in this confusing world under the sun, happen according to God's plan and timing. There is a time for everything. Even for evil things. But all our times are in God's hands. There is a time for everything.
Life is meaningful.
There is an overall plan and you are part of it. God has set eternity in your heart, and the only way that your heart's desire can be fulfilled is in Jesus Christ, who came to show us what God's plan was. More than that, he came to put that plan into effect. By what he did at a point within Time, he has saved his people for all Time. Hebrews 9 verse 26.