You will keep in perfect peace the mind that is dependent on You (Isa. 26:3)
That’s what you want—eh? Perfect peace—that is, peace that passes all understanding which guards your heart and mind!
You have enough troubles, worries and heartaches—you need peace.
How may it be attained? The passage tells you: it comes to those whose minds (heart—inner being) depend on God!
Fine, but how is that achieved? By faith—listen to the next verse:
for it [the mind] is trusting in You. (v.4 HCSB)
When we cast our cares upon Him in dependent trust, He, Who cares for us, removes the worry and frustration from us. Do you need such peace? Take heed.