What does this mean and how do we do it?

Eph. 4:23-24

Renew in Greek is ananēoō -to renovate, that is, reform: ( To renovate is to take the old out and put in the new)

2 Cor. 3:10
2 Cor. 4:16
Rom. 12:2
1 Cor. 2:10-16
1 Cor. 6:17
Col. 2:8-10
Phil. 2:5
1 Jn. 2:27
Jn. 16:13-15
2 Tim. 2:7
2 Cor. 10:3-5
Prov. 23:7
Rom. 10:9
Prov. 20:5
Rom. 8:5-6;9-11
Jn. 3:30
Acts 17:28
Is. 26:3

The word Peace in Hebrew is shâlôm -well, happy, friendly; welfare, health, prosperity, peace: -  favour, rest.

Col. 2:2-3