light an 'eternal flame' [=a small fire that is kept burning as a symbol to show that something will never end]
I will be 'eternally' grateful for your help.
When will his 'eternal' whining stop?
(..) But that I am forbid to tell the secrets of my prison house, I could a tale unfold... ...whose lightest word would harrow up thy soul and freeze thy noble veins But this eternal blazon must not be to ears of flesh and blood List, Hamlet, oh list. If thou didst ever thy dear father love... - Oh God! (..)2015 Hamlet