Psychology must be a practical science, concerned with the how and why of mental operations.
What appears good to one may appear evil to another， and vice versa.
讓人們相信謊言的一個(gè)可靠方法是頻繁重復(fù)，因?yàn)槭煜じ胁蝗菀着c真相區(qū)分開來。
The beauty of physics lies in its ability to reveal the hidden connections between seemingly unrelated phenomena.