Kato

“Do not fear your enemies. The worst they can do is kill you. Do not fear friends. At worst, they may betray you. Fear those who do not care; they neither kill nor betray, but betrayal and murder exist because of their silent consent.”
― Bruno Jasienski

“One day a man invited him into a richly furnished house, saying 'be careful not to spit on the floor.' Diogenes, who needed to spit, spat in his face, exclaiming that it was the only dirty place he could find where spitting was permitted.”
― Diogenes Laertius, The Lives and Opinions of Eminent Philosophers

“Just because you do not take an interest in politics doesn't mean politics won't take an interest in you. ”
― Pericles

“Those who know, do. Those that understand, teach.”
― Aristotle