Acts 17: 28
For in Him we live and move and have our being as even some of your poets have said, For we are also His offspring.
When we accept Jesus into our hearts as Lord and saviour, we are in Him. We live through Him.
When He died in the cross, we died with Him. When He was buried, our old nature was buried with Him. When He was resurrected, we were resurrected with Him.
Our acceptance by God is based on the sacrifice Christ paid for us on the cross, not on our performance.
Accepting this truth changes us into Christ likeness in our speech and conduct.