Hayagrīva: Spinoza. Spinoza says that "The infinite God must possess infinite attributes." He is saying that God, being the basis of all existence, cannot be described in a material way. He is a pantheist in the sense that he believes in the one substance. However, he believes that God has infinite divine attributes, and only two of these attributes fall within the realm of human experience, and these are thought and extension, or mind and matter.
Prabhupāda: So, so far God is concerned, and undoubtedly He is unlimited and His qualities are unlimited. So His one of the most important quality is called Bhakta-vatsala. He is very much dear to His devotee, Bhakta-vatsala. So He has unlimited devotees and unlimited dealings with them; therefore He is unlimitedly expanded. That is pantheism. But it does not mean because He is unlimitedly expanded, His personality is lost. He is person always, even though He is unlimitedly expanded. That is the Vedic version: pūrṇasya pūrṇam ādāya pūrṇam eva avaśiṣyate (Iso Invocation). He is complete, and if another complete form expands from Him, still He remains complete. He is not lost. The material conception is if one unit, if something is taken from it, then it becomes less of that thing. But God is so complete that you can go on taking from Him unlimitedly, still He remains unlimited. That is pantheist. I think they are impersonalist.