There are no interactions between different monads nor between entelechies and their bodies but everything is regulated by the pre-established harmony ( 78-9).

Leibniz, therefore, introduced his principle of pre-established harmony to account for apparent causality in the world.

"The one who perceives the pre-established harmony of the world."

"They move all orderly, in pre-established harmony," the Mouser replied.

In fact, Leibniz' theory of pre-established harmony in its strictest form was unacceptable for Knutzen on theological grounds.

Knutzen dissuaded Kant from the theory of pre-established harmony, which he regarded as "the pillow for the lazy mind".

This is also found in his expression of pre-established harmony being the actual basis of causation.

He believed in a "pre-established harmony" as a solution to the mind-body problem, dying 25 years before Leibniz's better-remembered formulation of the idea.

In Leibniz's philosophy, the doctrine of pre-established harmony was linked with optimism, the notion of this world as the "best of all possible worlds".

This is known as the doctrine of pre-established harmony.