Just an acknowledgement to the world really that it's true you can never imagine how parenting will challenge you.
You go into it knowing it's not going to be a walk in the park but until you're going through it, nothing can really prepare you for what it's like for you.
For me it's patience, I can't believe how much patience I have deep down and need to draw on frequently (constant teether and non crawler who is very frustrated, so there's a lot of whinging, rightly so, I'm sure I'd be the same!).