Whenever someone starts thinking that he has got all knowledge about something. It means that he has started to restrict his knowledge about that particular thing. And he’ll not try to add any knowledge about that thing anymore. So always try to avoid such kind of ego or over confidence or whatever you may name it, when you are dealing with day to day things whether in your work place or in your home or any other place.
In case of knowledge never feel saturated.
Be thirsty. Keep learning.