To one who has faith, no explanation is necessary.To one without faith, no explanation is possible.
行为主义者放在自己面前的规则或衡量标准总是:我能否用"刺激和反应"来描述我所看到的这一行为?
——《北上宣言》,1924年11月
Fearless is not the absence of fear. It's not being completely unafraid. It's having a lot of fears, but jumping anyway.