Preparation+and+Challenge

I was thinking. . .In order for an evolving system (such as a body or a mind) to reach a solution to certain problems, there has to be a balance between preparation and challenge. If there is too much challenge, then it may be too much for the system to handle and the system will become damaged or break. If there is no challenge, then there will be no selective pressure to maintain traits which could be useful in the face of challenge. In other words, the system won't "prepare" to meet future challenges and won't be ready for challenges when they come. Therefore, for an evolving system to improve toward meeting a certain goal, there has to be a balance between preparation and challenge.