Moreover, "life can only come from life" is the "Law of Biogenesis." The phrase is the definition of the theory.
Incidentally, the alternative to biogenesis, abiogenesis, which provides for life arising from non-life is an origin theory only. After the bootstrap, the law of "life can only come from life" applies according to The Nature of Evolution
Darwin's theory of evolution was about speciation only. He did not address abiogenesis in that theory. Life was taken as a given.
Nor did he ask or answer the far more important question, "what is life v non-life/death in nature?"
Without asking that question, he could not assert a serious theory of abiogenesis. His musings about a warm little pond were not a theory and were not part of the theory of evolution.
That is true, as we frequently point out.
But he never said or implied, "life can only come from life". This is a factual error that needs correcting.