As believers who live under grace (all that God did for us in Christ) and not under law (the Ten Commandments) does it matter then how we live?
The Bible teaches that as grace believers we should live a life pleasing to God.
Paul, whom the ascended Jesus personally taught, writes of pleasing God.
For example, in 1 Thessalonians 4:1-2 he writes:
“Finally, brothers, we ask and encourage you in the Lord Jesus to live in a way that is pleasing to God, as you have received from us. This is how you already live, so you should do so all the more.