Baruch Spinoza
God, that is, Nature: everything follows by necessity.
Misconceptions
Spinoza was an atheist.
He sets out to prove that God necessarily exists and puts the love of God at the summit of the Ethics. But his God is not a person: it wills nothing, chooses nothing, loves no one in the human sense. That is why he was accused of atheism in his lifetime. The debate is still open: pantheist, atheist in disguise, or mystic of reason.
For Spinoza, God is matter.
He denies it himself: those who think he identifies God with "a certain mass or corporeal matter" are wholly wrong. Matter (extension) is only one of God's attributes; thought is another, and there are infinitely many.
Spinoza preaches resignation: everything is written, so why act.
His ethics is one of the power to act and of joy. The free man meditates on life, not death, and seeks what is truly useful to him. Understanding necessity means ceasing to be tossed about by passions, not ceasing to act.