For sheer practical wisdom, Paul’s famous words have never been surpassed. He wrote: “Be careful for nothing; but in everything by prayer and supplication with thanksgiving let your request be made known to God. And the peace of God, which passeth all understanding, shall keep your hearts and minds through Christ Jesus.” It is when the love of God is allowed to penetrate every corner of man’s being that the peace of God comes as a positive gift, as a sturdy guardian of the soul’s inward rest. The sharing of anxieties and fears, this intimate thankfulness for joys and beauties, brings the individual very close to the life of God. It must be habitual and it must be practised, but its fruit is a relaxed spirit.
~J.B. Phillips in New Testament Christianity