The Latin word for 'forever' is aeternum.
In Latin, "Semper in corde meo" means "Forever in my heart." An expanded version of the phrase is "In meo corde aeternaliter" meaning "You are forever in my heart."
saved by the grace of god
Friends forever
"Forever in your heart" can be translated semper in corde tuo.
The Latin phrase meaning "for example" is exempli gratias, abbreviated e.g. The phrase's literal meaning is "for the sake of example."
Ad hoc.
a priori
a fortiori
are your meaning Per se? It's a Latin phrase meaning "in itself"
toto caelo
tabula rasa