quiétude

Dictionnaire

Une quiétude

Peacefulness
avec quiétude

With peace of mind
Calme et quiétude

Peace and tranquillity
la quiétude des lieux

the peace and quiet
Il vivra, en quiétude.

And the salutation at the end of prayer is in a plural form, and in case of solitude, it nearly loses its main concept.
QUIÉTUDE, NATURE, DISTINCTION

PEACE OF MIND, NATURE, DISTINCTION
des vacances en toute quiétude

holidays in peace
Recevez votre colis en toute quiétude.

Receive your package with trust.