“I understand too well the dreadful act
I'm going to commit, but my judgement
can't check my anger, and that incites
the greatest evils human beings do.”
Source: Medea
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Euripidés 116
ancient Athenian playwright -480–-406 BCRelated quotes

“I can't eat and I can't sleep. I'm not doing well in terms of being a functional human, you know?”
Variant: I'm not doing well in terms of being a functional human.
Source: It's Kind of a Funny Story

Full text of Blair's speech http://news.bbc.co.uk/1/hi/uk_politics/3697434.stm, BBC News online
Speech to the Labour Party Conference, 28 September 2004, referring to the fact that no WMDs had been found in Iraq.
2000s

“Philosophy has taught me to rely on my own convictions rather than on the judgements of others and to concern myself less with whether I am well thought of than whether what I do or say is evil.”
Docuit me ipsa philosophia a propria potius conscientia quam ab externis pendere iuditiis, cogitareque semper, non tam ne male audiam, quam ne quid male vel dicam ipse vel agam.
25. 160; translation by A. Robert Caponigri
Oration on the Dignity of Man (1496)

Interview with Luxemburger Wort (2015)
"Purely Personal Prejudices" http://books.google.com/books?id=DLcEAQAAIAAJ&q=%22A+person+who+is+going+to+commit+an+inhuman+act+invariably+excuses+himself++to+himself+by+saying+I'm+only+human+after+all%22&pg=PA232#v=onepage
Strictly Personal (1953)

Letter to Jonathan Jackson (2 October 1780), "The Works of John Adams" http://books.google.com/books?id=j9NKAAAAYAAJ&dq=John%20Adams%20works&pg=PA511#v=onepage&q&f=false, vol 9, p. 511
1780s