When my twin daughters were born six years ago, my elders tried to warn me, in the midst of their congratulations, about what was ahead.

“It’s a challenge,” they said. “It’s hard work, but the rewards are tremendous,” they said.

In those hazy, sleep-deprived days of early parenthood, I only remember my grandfather using a certain word: “Frustrating.”

It stood out back then and has continued over the past six years. My grandfather – “Grampy” – is one of the wisest people I’ve known. He had ten kids of his own, including my Mom, and they all turned out pretty well. What his parenting advice lacks in recency, it more than makes up for in volume of experience.

Raising children can feel like watching a schlocky horror movie from the 1980s. You often know exactly what comes next, but the characters behave absent of logic or perspective. No matter how many times you yell, “Don’t go through there!” at the screen, you still wind up with Cheerios spilled all over the floor, or a bump on the noggin, or a scraped knee, or any number of the horrors which may befall a young child. (You then have to convince said child that their pain and fear is temporary and minor. Good luck with that.)

The thing is, you know the ending (or at least what the ending could be). You’ve watched your kid succeed, and you know they can climb whatever mountain is in front of them. Kids don’t always see it; the view over their shoulder isn’t so long.

The kids themselves aren’t the biggest source of frustration.

A young child’s schedule has a surprising density to it, including school, doctor’s appointments, activities, and parties. They become easy to get wrapped up in. Then one day, you’re walking your kid to the bus stop for their first day of kindergarten, and you grow acutely sensitive to the passage of time. You feel the moments ticking past like grains of sand flowing through an hourglass, and wonder if you’ve appreciated it all as much as you should have. Did you really savor the holidays, the vacations, and even the lazy, rainy Saturdays as much as possible? You try to collect as many details in your memory as best you can, but you can only grab so much. There are so many, and yet so few all at the same time.

It’s frustrating.

Now for the sweet to go along with all that bitter: There’s more time. It’s not an infinite amount, and no one can know how much, but it’s there. Which means instead of getting weepily nostalgic for the past, enjoy building memories in the present.

So long as there is more time, there are more moments to enjoy, to gather, and to treasure.