Straight quote from gw2wiki:
“Focus, making yourself invulnerable and recharging your virtues.”
This skill worked perfectly until I started using the two folowing traits of the virtues line : Shielded Mind (grand master) & Indomitable Courage (master).
Now when using Renewed Focus it only recharges Virtue of Resolve and Virtue of Justice, leaving Virtue of Courage on its cooldown.