Jean-Paul Sartre is the premier philosopher on individual responsibility.  He would scold me for my habitual use of the words ‘can’t/cannot’, because of the psychological disposition they engender; one of irresponsibility and helpless captive to insurmountable forces. He would direct me to take complete responsibility for my beliefs, thoughts, words and deeds, and to substitute ‘refuse’ for can’t and ‘will’ for can.