Being in Christ, we live out from our union with Him. Being in Christ, seated in the Heavenly places, we live from the mind of Christ seeing everything from heavens perspective. This is to live by FAITH.
Faith is an attitude from something (or actually from someone) instead of towards something. This is what it means to enter into the rest of God. To see, think, feel, and act from Him, is to be at rest in His Rest. Just think how at rest God is on the inside. That is what He calls us into. From our union with Him, experiencing His rest, we can run to the battle, not from it.
Life as a Christian is one of REST, not stress. There maybe all kinds of stress on the outside, yet supernatural rest on the inside; His rest.