Agatha Christie said this quote

“ I believe at least in one of the chief tenets of the Christian faith--contentment with a lowly place. I am a doctor and I know that ambition--the desire to succeed--to have power--leads to most ills of the human soul. If the desire is realized it leads to arrogance, violence and final satiety; and if it is denied--ah! if it is denied--let all the asylums for the insane rise up and give their testimony! The are filled with human beings who were unable to face being mediocre, insignificant, ineffective and who therefore created for themselves ways of escape from reality so to be shut off from life itself forever. ”