You will surely leave the stage

No matter the excellent performance of characters on the stage, they will never be on the stage forever.
*If we will not live forever, your current situation can never be permanent, it will surely come to pass.*
Do not be carried away by; 

Who you are now

Where you are now

What you have now

What you can do now.

You will certainly lose them with time.
You will naturally or accidentally lose your strength, abilities, intelligence, zeal, fame and even your existence.
Be humble in your fortunes and be hopeful in your misfortunes, for no condition has perpetual existence.
May God bless and keep you.