一本好书是一个永远不会让你失望的朋友。
The only truly secure system is one that is powered off, cast in a block of concrete and sealed in a lead-lined room with armed guards - and even then I have my doubts.
The most sustainable product is one that lasts.
The most important thing in trading is to stay in the game. You have to be able to survive the bad times to make it to the good times.