The following quote (unattributed) is quite literally true:
"With every thought you have, the universe is a different place."
Everytime you have a thought - everytime something 'crosses your mind' - the universe is changed. The way it is configured, it's internal state is altered in some way. Be it ever so infinitessimal, it is nevertheless different. So each one of us has a bearing on the universe and if the butterfly effect is correct, we may even have an effect.