Salvation is by grace alone through faith alone. A grace that has touched someone's heart to save them shows evidence of a living faith that includes trust, abstaining from evil, and speaking truth in love. Does your life show a vibrant, living faith? It's up to you.
No one should lift themselves up through pride or think they are strong in and of themselves; we can fail no matter how good we think we are. We need to learn to be humble in this life; without humility, we cannot be close to the Lord. When we realize we are weak and frail, let's rely on God - He is our strength!
Some thought that since Paul didn't charge for preaching the gospel, maybe his message wasn't worth anything. Believer, don't let this tactic from the enemy stop you from preaching the gospel of Christ; don't back down especially during times like these.