Those which are produced from causes are not produced. they do not have an inherent nature of production. those which depend on causes are said to be empty; those who know emptiness are aware.
People lucky enough to live in the vicinity of an industrial hog farm are, with each breath, made keenly aware of the cause of their declining property values.
Malebranche teaches that we see all things in God himself. This is certainly equivalent to explaining something unknown by something even more unknown. Moreover, according to him, we see not only all things in God, but God is also the sole activity therein, so that physical causes are so only apparently; they are merely occasional causes. ( Recherches de la vérité , Livre VI, seconde partie, chap. 3.) And so here we have essentially the pantheism of Spinoza who appears to have learned more from Malebranche than from Descartes.