父尼布尔的《宁静祷文》(The Serenity Prayer)事实上就是一个对于边界的深刻思考: O God and Heavenly Father, Grant to us the serenity of mind to accept that which cannot be change；courage to change that which can be changed, and wisdom to know the one from the other, through Jesus Christ our Lord, Amen. 译文：神啊! 请赐予我宁静，好让我能接受，我无法改变的事情; 请赐予我勇气，好让我能改变，我能去改变的事情; 请赐予我睿智，好让我能区别，以上这两者的不同...... —— 译者:洪宋弦