Curiosity allows us to investigate inside without becoming too overwhelmed. When we have curiosity, we are deciding that we don't actually know what's there, but we might like to find out. Maybe it's different than we thought. This also allows us to challenge hardened beliefs- Was it always like this? Is it absolutely this way without a shadow of a doubt? Can it be different?
Learning to be curious creates a friendliness inside and outside. It challenges the ego-mind which always believes it "knows" and takes us into wider possibilities. Maybe this where we can see the larger picture, or find the missing information we needed for so long.