Penal Substitution & Universalism

[RanRan]

Why are we told to: “make every effort to live in peace with all men and to be holy; without holiness no one will see the Lord. 15 See to it that no one misses the grace of God”. Sounds like we are asked for effort here?
Should I not make every effort?

To be holy? Define how you accomplish that except through faith. The work (effort) of God is to have faith in Christ.

[roofus]

Why are we told to: “make every effort to live in peace with all men and to be holy; without holiness no one will see the Lord. 15 See to it that no one misses the grace of God”. Sounds like we are asked for effort here?
Should I not make every effort?

To be holy? Define how you accomplish that except through faith. The work (effort) of God is to have faith in Christ.

How do you look at faith? What is it?