Every good and perfect gift comes from the Father of lights in whom there is no shifting shadow. Salvation is a gift from God. But can your salvation be lost? Is it that fragile? Is it not a gift? You didn't earn it, did you? Is it not by His doing that you abide in Him?
"But", you may ask, "I could lose a gift, couldn't I?" Let me ask you a question, when was the last time you misplaced your house?
Jesus said, "In my Father's house are many mansions: if it were not so, I would have told you. I go to prepare a place for you." God has gifted you a house, a dwelling place in His heaven. That is salvation; living with Him forever.
Salvation is a gift from God, and it is a good gift given by a good Giver. Every good gift and every perfect gift is from above, coming down from the Father of lights, with whom there is no variation or shadow due to change. How could there be any flaw in His gift? Is He one to deceive or mislead? Does God mis-market? Does He promise with fine print?
Was He not the one who promised, "In my Father’s house are many rooms. If it were not so, would I have told you that I go to prepare a place for you?" We need removed from us the cynicism that life has dealt us, and only Jesus can do that.
Look at Peter. He saw Jesus walking on the water. He said, "Lord, if it's really you, tell me to come to you, walking on the water." He didn't query the Lord with specific questions that would prove beyond a shadow of a doubt that this was indeed Jesus walking on the water. No, Jesus had found a place in his heart and he knew he would know if it was the Master who called out to him.
Look at the woman at the well; no doubt jaded after five marriages. Broken relationship after broken relationship. Yet Jesus tore down those walls. He found a way into her heart and she saw who he was. The Messiah.
Let go of the doubt. Jesus will bring you safely home, into His loving arms.
Perhaps these assuring words penned by John, the one Jesus loved, will bring you comfort, "I write these things to you who believe in the name of the Son of God, that you may know that you have eternal life." Not that you might hope that you have eternal life. Not that you might be pretty sure that you have eternal life. That you may know that you have eternal life.
It's called resting, resting in the promise of God. And if you can't rest assured in His promises, if you can't trust Him to come through, who can you trust?