Sarah could still see signs of Sam’s sickness. He hardly seemed hale and hearty. In fact, his flesh was flabby. She wondered if he was willing to wander to the water to wink at the waves.
Okay, that was overexaggerated. (When are my examples not?) But I’m making a point here, and it’s a good one. Don’t use words that start with the same letter too frequently in one sentence. It makes the reader feel like they’re mentally stuttering when they read it.
I’ve seen authors successfully write an entire paragraph using the same letter repeatedly, but it was always tongue in cheek and never in a serious book. So if you want your reader to take you seriously, make sure you’re solemn and not silly.