1 John 5:2 By this we know that we love the children of God, when we love God, and keep his commandments.
1 John 5:3 For this is the love of God, that we keep his commandments: and his commandments are not grievous.
Matthew 7:19-23
19 Every tree that bringeth not forth good fruit is hewn down, and cast into the fire.
20 Wherefore by their fruits ye shall know them.
21 Not every one that saith unto me, Lord, Lord, shall enter into the kingdom of heaven; but he that doeth the will of my Father which is in heaven.
22 Many will say to me in that day, Lord, Lord, have we not prophesied in thy name? and in thy name have cast out devils? and in thy name done many wonderful works?
23 And then will I profess unto them, I never knew you: depart from me, ye that work iniquity.
So are you arguing with that poster that believers are not saved by grace? Be sure to tell the Lord that you are entitled to enter the kingdom based on you "good " works at the day of judgment.