仇恨和爱在本质上是否不是同一回事，这是一个值得观察和探究的奇怪主题。
It is a curious subject of observation and inquiry, whether hatred and love be not the same thing at bottom.
To understand the present, you must first understand the past.
La verdadera patria del hombre es su infancia.
The principles of learning are universal across species.