Conservation of function, but not genes, can be understood with an analogy to natural language. Consider two sentences.
I have been seeking to describe the science of purpose. Now it is worth getting down to the basics of what science actually is and how it works.
If lateral gene transfer is rampant throughout life, the universal tree of life becomes a matter of philosophical preference, not empirical demonstration.
The theory of evolution by natural selection was unveiled to a poorly attended and generally inattentive audience at a Linnean Society meeting.