من كانت معرفته بطبيعة الإنسان قليلةً إلى حدّ أن يسعى إلى السعادة بتغيير أيّ شيء سوى طبعه، فسيُفني عمره في جهودٍ عقيمة.

“He who has so little knowledge of human nature as to seek happiness by changing anything but his own disposition will waste his life in fruitless efforts.”Samuel Johnson — The beauties of Johnson: choice selections from his works (1851)