"From this day forward, Flight Control will be known by
two words: 'tough' and 'competent.' 'Tough' means we are forever
accountable for what we do or what we fail to do. 'Competent' means
we will never take anything for granted."
Source: Apollo Flight Director Gene Kranz, in
the aftermath of the January 27, 1967 Apollo 1 accident that
claimed the lives of astronauts Virgil "Gus' Grissom, Roger Chafee,
and Edward White.