These people tend to forget the essence of man's heart, which craves only for love, and kindness, and friendship, and loyalty.

craves 是动词 crave 的第三人称单数形式。crave 的意思是"渴望、热切期盼"，通常指对某种情感或事物的强烈需求。这个词带有一种内心深处的渴望感，比一般的want或desire更强烈。