Over the years, we've heard from believers who attended church regularly and would often walk out of the building wondering if they were still saved. They heard a works-based message which planted fear and doubt because they would begin questioning whether they were "doing enough" to guarantee their salvation. Certain people from the legalistic department who self-identify as judgmental "fruit inspectors" will suggest that some who have confessed Jesus Christ and called on the name of the Lord "didn't really mean it" and therefore, did not have a genuine conversion. They will point to works as the manifested proof in the pudding. But they fail to provide the specifics—or it will vary greatly among the denominations.
The blessed assurance or guarantee we have is found within the person of Jesus Christ and belief in Him. Although we are created in Christ for good works—God working in and through us—salvation is a gift by grace through faith (apart from works) and is not the result of any effort on our part. As Paul said in Romans 4:5: "But to him who does not work but believes on Him who justifies the ungodly, his faith is accounted for righteousness."
"God is good!" A phrase that gets thrown around a lot in Christian religious circles. Yet it shouldn't become just a catch-phrase for us. As we grow in grace and our understanding of the good news it becomes more of a reality that we can't be swayed from. Although we may not always understand why things happen the way they do, coming to the realization of the truth that God really is good (all the time) is a key component in regards to our attitude under grace.