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Thank you for your detailed and helpful answer.
Copleston actually believes that Spinoza assumed the relation of logical implication to be the same as the relation of causality, because in my opinion, in implication, the relationship between two or more propositions is two-way, that is, it is not possible for one to exist and not the other, or the violation of one is exactly equivalent to the violation of the other. Is. Just like the example that @180 Proof gave:

God/substance (independent idea) is like the ocean and the universe/infinite mode (dependent idea) is like an ocean wave...

-@180 Proof

Perhaps Copleston believes that Spinoza did not have a non-causal conception of God and the universe, but assumed causation as an implication. Do you think you have the same idea?

thank you very much.

I have reached a conclusion from your friends' answers and reviewing Copleston's explanation several times in this regard, which I wanted to share with you:
If the definition of necessity is as follows: the existence of something (proposition or object or any being in general) is completely dependent on another (proposition or object or any being in general) so that if one exists, the other must exist and the absence of one It is equal to the absence of another.

While in a causal relationship, the cause can be potentially, for example, parents who are the cause of the child's birth, potentially exist regardless of whether the child is born as an effect of the cause or not.

Now, if we assume that the relationship of logical necessity is the same as the causal relationship, the existence of parents becomes an actual cause for the existence of a child, that is, if there is a parent, then there is definitely a child, the absence of one is equal to the absence of the other.

As I said, Copleston believes that Spinoza has turned God from a potential cause of the universe into an actual cause.

what is your opinion?
@Janus
@Wayfarer
@180 Proof
@Paine
@Moliere


*My native language is not English and I apologize for the language problems in my sentences.

YES. exactly. this is Copleston quotation.thank you very much.

Yes, i'm Sorry i don't access to original english text of Copleston books.thank you for your comment.