定力是一个人的心性。心性是本，定力是表，定力强是心性强的一种表现，可以化不利为有利，变腐朽为神奇。它会让你做到：不以物喜，不以己悲；得也乐，失也安；顺境可处，逆境可居......Willpower is one's natural instinct. Natural instinct is intrinsic but willpower is extrinsic. Willpower is an expression of strong natural instinct and it can turn disadvantages into advantages and bad into good. It can also help people not to feel pleased for external gains and not to feel sad for personal losses, not to feel happy for gains and feel at ease even for losses, so that they can live a peaceful life in both good times and bad times ...