When it comes to the question "why does the universe exist at all", the only reasonable answer is the theistic one; an eternal God created it and continues to sustain it.
If you are a Christian, you are a “living letter” (2 Corinthians 3:1–3). Your life demonstrates the truth of the gospel, demanding a response from all around you. At the end of the day, there can be no neutral response to Christ. We will either walk in the blindness of the world or in the light of the Holy Spirit.
The book of James inverts the world's value system, contrasting the way of the Word with the way of the world, and urging us to choose the way of the Word.
We all ought to be more and more homesick. We are pilgrims, sojourners, wayfarers, aliens, and exiles on this earth. Our journey here is brief, ephemeral. But what we do today matters.
Our perspective—whether temporal or eternal—will determine our standards and the source of our hope, and our practice will reveal what that perspective truly is.
The wisdom psalms teach us to treat things according to their true value. They give us perspective to see what is temporal and what is eternal, enabling us to live in light of that reality.