Wiktionary
adv. confidently, because one is certain that something relevant to the situation is true.
Usage examples of "safe in the knowledge".
Anyhow, you may recall last year that we donned masks in another escapade, and took all manner of liberties with our companions hired for the night, safe in the knowledge that our identities remained secret.
And he could sleep safe in the knowledge that he had left his enemies behind him, and that now he had a destination, a place to voyage toward, the place where his bloodline might still live.
Only then could he relax, safe in the knowledge that Kee-yes vain Lewmaklin was still a trusted ally of the Nuel, and Chaheel Riens a paranoid idiot.
They can have the revenge, revenge, for the harm done to them five, ten, twenty, a hundred standard years ago, safe in the knowledge that no Imperial stormtroopers will break down their door and take them away.
The memory made him smile, so he repeated the word again, safe in the knowledge that Most Fearsome was dead and wouldn’.
His eyes closed, safe in the knowledge that his plan was still known only to himself.