Perfect peace regardless of trials is a result of keeping our minds steadfast, set on God, trusting, desiring, depending on Him—not in ourselves, not in other people, not in our abilities or possessions but on God because He is our reliable, eternal unshakeable foundation.

Isa 26: 3

NIV
3 You will keep in perfect peace
those whose minds are steadfast,
because they trust in you.
4 Trust in the Lord forever,
for the Lord, the Lord himself, is the Rock eternal.

MSG
People with their minds set on you,
you keep completely whole,
Steady on their feet,
because they keep at it and don’t quit.
Depend on God and keep at it
because in the Lord God you have a sure thing.

CJB
3 “A person whose desire rests on you
you preserve in perfect peace,
because he trusts in you.
4 Trust in Adonai forever,
because in Yah Adonai,
is a Rock of Ages.”