解析:其实说的是:不着相,不动心。
研究心灵就是研究适应行为;每个思想都是生活的工具。
The human being cannot live in a condition of emptiness for very long: if he is not growing toward something, he does not merely stagnate; the pent-up potentialities turn into morbidity and despair, and eventually into destructive activities.