Sand Beneath My Toes

What's your favorite part of going to the ocean?
I love to stand at the edge of the water, letting the foamy waves rush over my feet again and again, scooping up any treasures I notice washing up, feeling the sand slipping away as the water recedes once more.
The first time my four-year-old daughter experienced this, she was very concerned. After all, it is slightly disconcerting to feel something you considered solid and safe to start deteriorating under your toes. Would the waves carry her out to sea, too? Where was it going? Why was it happening? By the end of our vacation, she loved it, too, giggling at the sensations.
But think about it. It's a Bible lesson in and of itself, isn't it? God teaches us that if we build our foundations on shaky unsolid ground, it will be washed away one way or another. We have to have a base that's firm and won't erode so quickly. Isn't it amazing how God put those little reminders of big lessons in our little everyday activities? It's like He knew we'd need the reminders.
What about you? Do you love the feel of the water washing away the ground you're standing on? Does it make you nervous? How about in real life? How's your foundation?