For the law of the Spirit of life in Christ Jesus has set you free from the law of sin and of death.
The word for law here means “rule”. Before Christ we were under the rule of sin and death (separated from the God-kind of life). But in Christ Jesus we are now under the rule of the Spirit of life, which is translated as a life real and genuine, a life active and vigorous, devoted to God, and blessed. The old nature of sin leading to death has been removed. As you receive a new spirit within you, your spirit now has residing in it the Spirit of God Himself. His Spirit is where this “Zoe” life comes from.
To allow this new life to rule over us, we need to walk in line with the Word of God, and be led by the Spirit of God that now dwells in us. Jesus said the Words He spoke are Spirit and they are life. When we choose to walk in line with God’s Word, which includes having our thoughts governed by His Word, we are coming under the rule of this law of the Spirit of life, which frees us from the rule of sin and death (separation from the God-kind of life).
We also need to be led by the Holy Spirit from within. The Holy Spirit bears witness with our spirit man. We need to learn to listen to our spirit, what our heart is leading us to do. Our conscience is the voice of our spirit man. If we listen to our conscience we can be led by our spirit and walk in the Spirit of life. Follow the inward witness, and walk in line with the Word of God, for the Word and the Spirit agree. As you do you will experience the rule of the Spirit of life over you, and you will walk free from the power of sin and death, no longer separated from the life God has for you.