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Growth is painful but necessary.

The key to credible causal inference is not just the method, but how well the method fits the question at hand.

快樂激發(fā)玩耍的沖動(dòng)，興趣激發(fā)探索的沖動(dòng)，滿足激發(fā)品味和整合的沖動(dòng)，而愛在安全、親密的關(guān)系中激發(fā)這些沖動(dòng)的循環(huán)往復(fù)。