The only existence we conceive is the existence of sensible things.
The concept of reducibility is central to understanding the relationships between different computational problems.
【解释】幸福不可强求,保持愉快的心情,更能感受到幸福;灾祸难以避免,消除怨恨他人的念头,就能远离灾祸。
The investor's chief problem—and even his worst enemy—is likely to be himself.