I've done a bit of programming in lisps and scheme, and have recently been working on a ruby project. While I enjoy ruby, I'm finding it difficult to reason precisely about the code I write in it, because the semantics are so complex and everything is so dynamic and fragile. It makes me anxious as a build and add complexity.

With lisps and other languages like haskell, the semantics are extremely simple.

That's probably pretty vague, but it's another perspective.