How does one attain (or fail to attain) the grace of God in this context? Is this speaking of initial salvation or something else?
Hebrews 12:15
ESV - 15 See to it that no one fails to obtain the grace of God; that no "root of bitterness" springs up and causes trouble, and by it many become defiled.
For follow-up discussion and general commentary on the topic. Comments are sorted chronologically.
In my thinking, Christ died for all. But if you don't know this or aren't aware how can you live it out. Therefore it is incumbent upon us to inform them by telling them the gospel, so that they can know they have salvation by grace.