Have you ever looked back on something that once consumed your thoughts and wondered, Why did I spend so much time worrying about that?

I have.

I’ve lost sleep over problems that eventually worked themselves out. I’ve rehearsed conversations that never happened. I’ve worried about what someone thought of me, only to realize later that it really didn’t matter.

And here’s the uncomfortable truth: I can’t get that time back.

In Psalm 39, David seems to be wrestling with something similar. He is determined to guard his tongue.

“I will guard my ways, that I may not sin with my tongue.” (v. 1)

But keeping quiet doesn’t bring him peace. Instead, his emotions intensify.

“My heart became hot within me. As I mused, the fire burned; then I spoke with my tongue.” (v. 3)

I’ve been there, too. Sometimes I think remaining silent will settle what’s troubling me, but the conversation inside my head only gets louder.

Then David makes a surprising request:

“O LORD, make me know my end and what is the measure of my days; let me know how fleeting I am!” (v. 4)

David isn’t asking for the date of his death. He’s asking for perspective. He wants to remember how brief life really is. I often need that perspective.

I’ve always known that life is short. But losing both of my parents made that truth painfully personal. There are moments when I would give anything to hear their voices again, sit across the table from them, or have one more ordinary conversation. Ordinary routines from the past have transformed into cherished memories.

And I sometimes wonder how many moments I allowed to slip by because I was distracted by something that, looking back, wasn’t nearly as important as I thought.

Perhaps that’s why Moses’ prayer in Psalm 90:12 resonates so deeply with me:

“So teach us to number our days that we may get a heart of wisdom.”

Moses wasn’t asking God to teach him how to count. He was asking God to teach him how to live.

There’s a difference between knowing our days are numbered and living as though they are.

David describes our days as a mere breath: here today, gone tomorrow. Far from being depressing, this perspective can be deeply clarifying. When we remember how short life truly is, we naturally ask different questions.

Is this disagreement worth the energy I’m giving it? Will this worry matter a year from now? Am I spending my limited days on what matters most—or merely on what demands my attention? Am I so busy worrying about tomorrow that I’m missing today’s blessings? And am I giving the people I love the time and attention they deserve while I still have the opportunity?

But David does not leave us with the brevity of life—he points us directly to the One who gives it meaning.

“And now, O Lord, for what do I wait? My hope is in you.” (v. 7)

That’s the turning point.

David moves from measuring his days to remembering where his hope belongs. Life is short. Circumstances change. People disappoint us. Possessions don’t last. Even our best plans can unravel.

But God remains.

And that’s what I need to remember most. I can’t make my life longer by worrying. I can’t recover yesterday by replaying it. And I can’t guarantee tomorrow by trying to control it.

But I can choose how I live today.

I can speak more carefully, love more generously, forgive more readily, and spend less time on things that won’t matter in eternity. I can make the call, extend kindness, speak words of encouragement, and stop postponing what matters most.

And when my thoughts become overwhelming, I can do what David did. I can bring them to the Lord. I can’t add another day to yesterday, and I’m not promised tomorrow. But God has given me today.

So perhaps my prayer should be the same as Moses’:

Lord, teach me to number my days—not so I’ll spend them worrying about how few I may have left, but so I’ll live wisely with the ones You’ve given me.

Life is too short to waste—and too precious to live without hope in God.

(Note: The graphics are AI-generated.)