“The only true wisdom is in knowing you know nothing.”
“True knowledge exists in knowing that you know nothing.”
“As for me, all I know is that I know nothing.”
“As for me, all I know is that I know nothing, for when I don't know what justice is, I'll hardly know whether it is a kind of virtue or not, or whether a person who has it is happy or unhappy.”
“I only know that I know nothing”
“I know I'm intelligent because I know that I know nothing.”