The only limits that exist are the ones in your mind.

爱是世界上最强大的力量。

To understand behavior, look for the utility in it.

对生命的研究就是对无限可能性的研究。

我并不完美。我和其他人一样会犯错。

国君自以为神圣聪明，而不去咨询官吏，自以为国家安定强大，而不注重防守，周围的邻国图谋侵略他却不知道戒备。 

I think it's important to have closure in any relationship that ends - from a romantic relationship to a friendship.