'There are times in life when people must know when not to let go. Balloons are designed to teach small children this." Terry Pratchett (Thanks for the laughs and the learning challenges hidden within the Discworld) 28 April 1948 – 12 March 2015
"Nine-tenths of tactics are certain, and taught in books: but the irrational tenth is like the kingfisher flashing across the pool, and that is the test of generals". TE Lawrence