How can I witness to someone about their salvation if I’m not certain of my own? The reason some are not certain of their own salvation is because they do not know the exact date or time in which they “crossed the line”. Unfortunately, they may have been told that if they don’t know the date they were saved, then they are not saved. Nothing could be further from the truth.
There is an exact second a person crosses the line from darkness into light - an exact moment when an eternal transaction takes place and they are forever a child of God. God knows when that date, time, and place was. But just because you don’t know does not mean you are not saved. If you trust is in Christ alone as your only way to heaven, you are forever a child of God regardless of when you crossed the line.
When Scripture gives assurance of salvation it always goes back to a fact not to a date. We are told in John 6:47, “Most assuredly, I say to you, he who believes in Me has everlasting life.”