I recently came across a quote, “the imagination is Mara’s playground”. I found it interesting, because so many things that place human beings in samsara are driven by the imagination. For example, my-making is a process where you first imagine something is yours before you convince yourself that it is so. Or anger arising from some imagined slight.
So it seems to me that one of the things that contributes towards peace and wellbeing is placing constraints on the imagination.