The phrase "nature of beast" refers to the inherent characteristics or tendencies of animals, particularly wild or ferocious ones. Some possible antonyms for this phrase could include terms like "docile," "tame," or "gentle," which might describe creatures that are domesticated or trained to be submissive to humans. Other antonyms might focus on human qualities, such as "compassion," "empathy," or "altruism," which would suggest a departure from the selfish or predatory nature often associated with beasts. Ultimately, the antonyms for the phrase "nature of beast" would likely depend on the context and purpose of the discussion.