Excerpt from Die Lehre Spinoza'sEth. 1, Def. 1: Per causam sui intelligo id, cujus essentia involvit existentiam, sive id, cujus natura non potest concipi, nisi existens. Prep. 7: Ad naturam substantiae pertinet existere. Prop. 20. Of. Ep. 41, pag. 597: Ens, quod propria vi existit, sua sufficientia subsistit.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully, any imperfections that remain are intentionally left to preserve the state of such historical works.