Like attracts like. 物以类聚。

Like author, like book. 书如其人。

Like begets¹ like. 有其父必有其子。

Like cow, like calf². 有其父必有其子。

Like cures like. 以毒攻毒。

Like draws to like. 物以类聚。

Like draws to like the whole world over. 物以类聚，世间皆如此。

Like father, like son. 有其父必有其子。

Like knows like. 英雄识英雄。

Like mother, like daughter. 有其母必有其女。

Like teacher, like pupil. 有其师必有其徒。