A partner of Matthias Schleiden, Schwann found similar evidence to that of Schleiden's, in that all plants are made of cells. He therefore stated, "All living things are composed of cells and cell products." This statement became the cell theory for the time. Also, by stating this, he is saying that life, tissues, organs, etc... come from cells. This statement further contributed to the abandonment of the spontaneous generation theory because it doesn't comply with the theory that life comes from inanimate matter.