奢者富不足，俭者贫有余；奢者心常贫，贫者心常富。
奢侈者常嫌不够富足，节俭者虽贫穷却有余藏；奢侈者心常常贫困，节俭者的心常常富贵。
The secret of change is to focus all of your energy not on fighting the old, but on building the new.
The most effective debugging tool is still careful thought, coupled with judiciously placed print statements.