According to the query of Sentence.com, "Nothing is trivial, nothing is ruthless" means that a person is physically and mentally relaxed and has no chores. This sentence first came from Su Shi's "Giving birth to four grandchildren by borrowing the previous rhyme".
The original meaning refers to the exploitation and oppression of ordinary people's lives by feudal bureaucrats. Later, people often use this sentence to comfort themselves. Now it also means to feel relaxed after unloading responsibility.