I think you have to control the materials to an extent, but it's important to let the materials have a kind of power for themselves; like the natural power of gravity, if you are painting on a wall, it makes the paint trickle and it drips; there is no reason to fight that.
“Normally I would not recommend a book that tells you how to make money in the stock market. Most of these books are aimed at gullible folk, and they usually make much more money for their authors than they do for the investing public.”