The original quotes are solidly in the public domain, but newer translations may be protected. However, reasonably short, properly cited quotes are generally defensible under fair use.
To copyright quotes, you can include them in a larger work that you register for copyright protection. This will protect the quotes as part of the overall work. Additionally, you can also register individual quotes with the U.S. Copyright Office, but keep in mind that the quote must be original and meet the requirements for copyright protection.
Know you, yourself
Socrates' quotes often focus on virtues such as wisdom, self-awareness, and ethics. They encourage critical thinking, self-examination, and the pursuit of knowledge to lead a more examined life. These quotes continue to inspire individuals to question assumptions, engage in meaningful dialogue, and strive for personal growth and understanding.
Reasonably short quotes, properly cited, should be defensible under fair use.
(on humility in the face of knowledge) "As for me, all I know is that I know nothing."
if you use there quotes.
Yes, quotes can be copyrighted if they meet the requirements for copyright protection, such as being original and fixed in a tangible form.
Generally you can use short quotes with attribution without even asking for permission.
No, Socrates never wrote any texts. His student Plato wrote quotes from him after his execution. THE accuracy of this is uncertain, as Plato was also pushing his own agenda.
"As for me, all I know is that I know nothing."
Reasonably short quotes, properly attributed, should be defensible under fair use.
All works of Elbert Hubbard are in the public domain.