Spinoza's Ethics: III.P6 - Persevering in Itself

Unaquæque res quantum in se est, in suo esse perseverare conatur.

Howsoever much a thing in itself, it tries to persist being in itself.

DEMONSTRATIO: Res enim singulares modi sunt quibus Dei attributa certo et determinato modo exprimuntur (per corollarium propositionis 25 partis I) hoc est (per propositionem 34 partis I) res quæ Dei potentiam qua Deus est et agit, certo et determinato modo exprimunt neque ulla res aliquid in se habet a quo possit destrui sive quod ejus existentiam tollat (per propositionem 4 hujus) sed contra ei omni quod ejusdem existentiam potest tollere, opponitur (per propositionem præcedentem) adeoque quantum potest et in se est, in suo esse perseverare conatur. Q.E.D.

For singular things are modes by which the attributes of God are expressed in a certain and determinate mode (by IP25C), that is (by IP34) things which express by a certain and determinate mode the power of God by which God is and acts, and nothing has something else in itself by which it is able to be destroyed or which destroys its existence (by IIIP4) but placed against all else which is able to destroy its same existence (by IIIP5)  to the extent that it is much and is in itself, it tries to persevere being in itself.

Here Spinoza sets up the almost inertial power of modes or singular things - they tend to persist even though they are rooted in and express the power of God. The tendency of modes to do this is viewed objectively at this point, but its attempting or trying to do something sets up the subjective element to modes.