Do you recite mantras/formulas/say anything when casting spells?

[Elvensilver]

As Heavenblade, only ever with divine casters.

[Deity of choice], bless my friends!/smite the evildoers! (paladins, from my experience, always supplement their smiting with a battle cry) /etc. just sounds way better than calling out "Fireball!

I've once read the idea to just say the spell's name backwards, such (going from Pathfinder/D&D-spells) as "Etsah", "Romra Egam" or the more tongue-twisting "Noitatigiditserp" which seems like a quick and simple (if sometimes silly) way to incorporate the verbal components of spells.