Final answer:
The quote from Charles Darwin should be directly quoted in an essay on the scientific method to preserve the powerful expression of his scientific ethos and provide strong support for the thesis.
Step-by-step explanation:
In your essay on the development of the scientific method, the quote from Charles Darwin should be directly quoted. A direct quotation is appropriate when the individual has a strong ethos and the quote provides essential evidence in a distinctive or particular way. Darwin's expression of his commitment to empirical evidence over personal bias is reflective of the scientific process, making his words a powerful testament to the ethos of scientific investigation. Additionally, paraphrasing such a precise articulation could diminish its impact or alter its meaning. Hence, direct quotations can greatly enhance the credibility of your argument and provide strong support for your thesis, particularly when discussing influential figures like Darwin whose contributions have shaped fundamental scientific concepts such as evolution by natural selection.