Legend has it that when he once gave a speech at Harrow School, he simply stood up and said, 'Never give in, never, never, never. Never give in.' He knew those simple words make such a difference. Whatever your walk in life, the ability to dig in and not quit when it gets tough will not only set you apart, it will set you up for a more exciting, more fulfilled and more prosperous life. That dogged resolve, that never-say-die attitude, takes people to a place that few are prepared to explore. And it is here that life becomes most interesting. So, when you think you've exhausted all possibilities, look inwards and just remember one thing: you haven't! You always retain the ultimate decision whether or not to hang on in there. No one can force you to quit. And luckily Churchill knew that this tenacity had power. 'Never give in, never, never, never. Never give in.' He didn't need to say any more during that speech. They were the wisest few words he could ever have imparted to those pupils - and it was a lesson learnt the hard way, at the bleak coalface of war.