Cicero, Ad Atticum 7.7:
Cetera videntur esse tranquilla; tranquillissimus autem animus meus qui totum istuc æqui boni facit.
Everything else seems to be going peaceably; and my mind is quite peaceable itself, taking the whole thing with contentment.
I don’t think I have the second half of this second sentence right at all. Tranquillissimus autem should mean his mind is even more peaceful, this mind of his which is taking it so contentedly.