It is probably no exaggeration to say that all of theoretical physics proceeds by analogy.
Elementary Particles and their Currents Philosophical Preface (p. vii)
Campbell, Norman Robert
...analogies are not "aids" to the establishment of theories; they are an utterly essential part of theories, without which theories would be completely valueless and unworthy of the name. It is often suggested that the analogy leads to the formulation of the theory, but that once the theory is formulated the analogy has served its purpose and may be removed or forgotten. Such a suggestion is absolutely false and perniciously misleading.
Physics, The Elements Chapter VI (p. 129)
Analogy is even slipperier than logic.
Stranger in a Strange Land Part III
Chapter XXIV (p. 318)
O Nature, and O soul of man! How far beyond all utterance are your linked analogies! Not the smallest atom stirs or lives on matter, but has its cunning duplicate in mind.
Moby Dick Chapter 70
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