The science of real as distinguished from phenomenal being; ontology; also, the science of being, with reference to its abstract and universal conditions, as distinguished from the science of determined or concrete being; the science of the conceptions and relations which are necessarily implied as true of every kind of being; phylosophy in general; first principles, or the science of first principles.
Hence: The scientific knowledge of mental phenomena; mental philosophy; psychology.
Metaphysics is a dark ocean without shores or lighthouse, strewn with many a philosophic wreck. Immanuel Kant
Consequently he who wishes to attain to human perfection, must therefore first study Logic, next the various branches of Mathematics in their proper order, then Physics, and lastly Metaphysics. Maimonides
To think Being itself explicitly requires disregarding Being to the extent that it is only grounded and interpreted in terms of beings and for beings as their ground, as in all metaphysics. Martin Heidegger
To regard the imagination as metaphysics is to think of it as part of life, and to think of it as part of life is to realize the extent of artifice. We live in the mind. Wallace Stevens
The verbal interpretation, on the other hand, i.e. the metaphysics of quantum physics, is on far less solid ground. In fact, in more than forty years physicists have not been able to provide a clear metaphysical model. Erwin Schrodinger