"A ship is safe in harbour, but that’s not what ships are for." — William Shedd
Ships aren't built so they can sit there in a harbor. Ships are built for sailing and adventures in the sea. There may be risks, but hey, that's what the ship was made to do. Much like a person can be safe and comfortable with status quo, but that's not the point of improvement. The point of continuous improvement is to explore and challenge our understanding, not to mindlessly accept what we have always done.
Leaders need to challenge their employees to move out of their comfort zone. You can’t move forward if you don’t grow and you can’t grow if you never leave your comfort zone. When possible, give your employees challenging assignments. Help them prepare by providing them a safe environment to learn from the mistakes that they are bound to make.
Moving beyond our comfort zones is how we can best learn and grow. The challenge is to resist our normal human instinct to seek comfort rather that discomfort. The key is to continually push beyond the comfort zone and drive continuous improvement to develop and strengthen your Lean thinking.