It means we are often attracted to the missing or un-integrated parts of ourselves.
The free spirited type might be attracted to the conservative type.
The introvert to the extrovert.
The thinker to the feeler.
On & on.
While some differences can be complementary, mostly they end up being areas of conflict that show each person where their weaknesses lie.
The ideal of a fully whole and integrated pysche is to be in balance.
This doesn’t mean an extrovert will turn into an introvert or vice versa, but it does mean you learn to grow, and enhance, master, or modify the traits you could use work on.
This also applies to the male/female polarites…yin & yang, and each sexes need to embrace their totality. The woman who can be strong and tough and make rational, logical decisions without emotional fallout.
The man that can feel his feelings, and find pleasure in his nurturing side.
As a mature person one tends to seek likeminded others, not polar opposites to play out the same old routines with.
” WHY can’t you be more social?”
” WHY can’t YOU be quieter?”
” WHY do YOU spend so much money?”
” WHY are YOU such a cheapskate?”
Usually opposites end up creating a match made in hell a lot of the time. lol