Ironically, spontaneity in adults is achievable only through the utmost deliberate effort. Adults know too much. That’s the problem. Children are spontaneous (in fact, they cannot be otherwise) because they do not know anything. They do not know how scary and hurtful the world can be. Or how deliciously addictive pleasure is. But adults do. They get attached to people, emotions, ideas, and all sorts of things based on both the pleasant and painful experiences they have had. Attachment creates expectation, and when expectations are let down, adults suffer.
Spontaneity is the opposite of this process. It’s doing what you feel like doing despite the preconceived ideas of pain the act may bring about or of pleasure it may compromise. Spontaneity in adults, therefore, is braving an action despite the knowledge that one may very well be hurt. It is an act of transcending limits.