“Everything that needs to be said has already been said. But since no one was listening, everything must be said again.”
- André Gide

Aphorism.
An aphorism is a concise and pithy statement that expresses a general truth or insight, often with a sense of wisdom or wit. An aphorism is supposed to provoke thought. It needs to contain a twist, a paradox, an opacity, an element of wit.Truism.
a statement that is obviously true and says nothing new or interesting.Epigram.
An epigram is a concise, witty, and often satirical statement, typically expressing a single thought or idea. Examples include "I can resist everything except temptation" – Oscar Wilde, and "All animals are equal, but some animals are more equal than others" – George Orwell. Other examples highlight the power of words or the nature of human experience.
Here are some more examples of epigrams:
"A room without books is like a body without a soul" - Marcus Tullius Cicero
"It is better to be hated for what you are than loved for what you are not" - André Gide
"The road to hell is paved with good intentions" - Various (an example of a common saying that can also be considered an epigram)
"The only way to have a friend is to be one"
"If you would not be forgotten as soon as you are dead and rotten, either write things worth reading or do things worth the writing"
"The Child is father of the Man"Mantra.
A mantra is a motivating chant, like the “I think I can, I think I can” you repeat over and over to yourself on the last stretch of every marathon you run.
A mantra is usually any repeated word or phrase, but it can also refer more specifically to a word repeated in meditation. Mantra comes from a Sanskrit word meaning a “sacred message or text, charm, spell, counsel.” The Indian spiritual leader Sri Sathya Baba said, “A pure thought from a pure heart is better than a mantra.” Meaning, a mantra is great and all, but really, pure intentions and genuine kindness mean more.Declaration.
A declaration is a formal statement or announcement, often used to express a legal right, opinion, or intention.Maxim.
a short, pithy statement expressing a general truth or rule of conduct.
Motto. A motto is a brief phrase that expresses a principle, goal, or guiding idea. Mottos can be aspirational.Exhortation.
communication emphatically urging someone to do something. language intended to incite and encouragePlatitude.
A platitude is a statement that is trite, meaningless, and often presented as profound or wise, but lacks genuine substance or insight. A platitude is a phrase that pretends to be profound but ultimately offers little real value.