"That line of investigation I leave to you with your metaphysical theories and esoteric hypotheses."

This view of the reciprocal causal independence of mind and matter has no basis except in metaphysical theory.

In philosophy his main efforts have been his opposition to positivism and his attempt at a new metaphysical theory.

Dunne's theory of time has parallels in many other scientific and metaphysical theories.

Futurism Chwistek never intended his views to constitute a new metaphysical theory.

It seems at least worth trying to construct a metaphysical theory that reduces some of the arbitrariness of the world.

Other metaphysical theories may use the terminology of universals to describe physical entities.

By contrast, other metaphysical theories merely use the terminology of universals to describe physical entities.

His task, as in any metaphysical theory, was to account for every aspect of existing reality in the simplest and most economical basis.

He also comes up with some much more metaphysical theories.