9 The heart is deceitful above all things, and desperately wicked: who can know it?
10 I the Lord search the heart, I try the reins, even to give every man according to his ways, and according to the fruit of his doings.
The heart refers to the mind, the source of thinking, feeling, and action.
And be not conformed to this world: but be ye transformed by the renewing of your mind, that ye may prove what is that good, and acceptable, and perfect, will of God.
Conformed means “to form” or “mold.”
World is the normal word for “age” or “era”.
Instead of being molded by the values of this world, we, as believers, should be transformed, that is, changed by the renewing of our mind.
Spiritual transformation starts in the mind and heart. A mind dedicated to the world and its concerns will produce a life tossed back and forth by the currents of culture.
A mind dedicated to God’s truth will produce a life that can stand the test of time. We can resist the temptations of our culture by meditating on God’s truth and letting the Holy Spirit guide and shape our thoughts and behaviors.
WE CAN’T CHANGE BY CONTINUING TO DO THE SAME THING