"My son, do not forget my teaching,
But let your heart keep my commandments;
For length of days and years of life
And peace they will add to you.
Do not let kindness and truth leave you;
Bind them around your neck,
Write them on the tablet of your heart.
So you will find favor and good repute
In the sight of God and man.
Trust in the Lord with all your heart
And do not lean on your own understanding.
In all your ways acknowledge Him,
And He will make your paths straight.
Do not be wise in your own eyes;
Fear the Lord and turn away from evil.
It will be healing to your body and refreshment to your bones"
Proverbs 3:1-8 (NASB)
This well-known passage of the book of Proverbs, in the Old Testament, talks about the effects of our relation with the Word of God. It clearly says that if we keep His commandments in our hearts, subordonating our own understanding to the Lord, it guarantees us a long and peaceful life. More, it says that fearing God, that is, respecting Him, obeying Him, submitting to His discipline and worshipping Him, assures us physical healing and strength ! It is interesting to note that the book of Proverbs has been composed around the IVth century BC, far, far before the scientific demonstration of the benefits one can draw from a true and wilfull submission of his ou her heart and soul to God, through prayer and meditation.
See also Proverbs 4:20.