Once and for all phrase
Permanently or finally
I'm going to stop smoking once and for all.
I only played this game once and for all.
One very nearly achieved or got something, but in the end you just failed, or there is still some difficulty to do before that can happen.
Forever or eternally
1. Used to indicate something lasts forever
2. Said when you believe something will never happen
If you say that you can do something all in due time, you mean that you can ultimately finish at an appropriate time.
If you do something “till you are blue in the face”, you do it with many efforts but receive no or less success.
This phrase dates back to the fourteenth century.