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States are rational actors that seek to maximize their relative power in order to ensure their survival in a competitive international system.

Innovation is not about inventing new things, but doing old things in new ways.

There is no greater agony than bearing an untold story inside you.

對圣賢的道理教導別人很容易，自己實踐卻是不容易的事。對圣賢的道理開始奮斗很容易，但堅持到底卻很難。圣賢的道理與實踐相結合，行仁政必本與德性。后代則相反，學問與實踐不能統一，不修持自己的德性，而只管治理別人。