There are so many hokey leadership quotes bandied about by people these days. Many of them are empty, rehashed quotes of Sun Tzu, picked up and perpetuated by people whose best days are behind them. At the risk of spouting rhetoric myself, George Bernard Shaw said "He who can, does; he who cannot, teaches". 

I came across this set of quotes from an eminent group of tech CEOs put together by the BBC over 6 months ago. I missed it at that point but I thought it was well worth a read/watch. There are some really good snippets in there.