It seems you are referring to Rudolf Virchow, not "Rudolf". He was a German physician and pathologist who is known for his significant contributions to cell theory.

While the cell theory itself was formulated by Matthias Schleiden and Theodor Schwann, Virchow added a crucial and now foundational component to it:

"Omnis cellula e cellula" meaning "All cells arise from pre-existing cells."

Prior to Virchow, the prevailing belief was that cells could spontaneously generate from non-living matter. His work, based on extensive observations, proved that cells can only originate from other cells through division.

Here's how Virchow's idea revolutionized cell theory:

* Disproved spontaneous generation: Virchow's observations challenged the long-held belief in spontaneous generation, a cornerstone of the theory of abiogenesis.

* Established cell division as the primary mode of cell reproduction: His work established cell division as the fundamental process of cell multiplication, providing a scientific foundation for understanding growth, development, and repair in living organisms.

* Led to a deeper understanding of disease: By demonstrating that cells are the fundamental units of life and that they arise from other cells, Virchow provided a framework for understanding how diseases develop and spread.

In conclusion, Virchow's contribution to cell theory was vital. He established the principle that cells can only originate from existing cells, which fundamentally changed the way we understand life and disease.