Doubting your salvation?
"For I am not ashamed of the gospel of Christ: for it is the power of God unto salvation to every one that believes...for therein is the righteousness of God revealed from faith to faith: as it is written, The just shall live by faith." (Romans 1:16,17)
Here we see that the basis of salvation is faith (trust, or belief), not works; and it is given to those who have faith in this means of salvation. Now faith is not faith, unless it has an object that it is trusting in. (Something that it believes.)
If we can say like the apostle Paul, "..for I believe God, that it shall be even as it was told me." (Acts 27:25), then our object of belief should be in what God has said. "If we receive the witness of men, the witness of God is greater...he that doesn't believe God has made Him a liar; because he doesn't believe the record that God gave of his Son. And this is the record, that God has given to us eternal life, and this life is in his Son. He that has the Son has life; and he that doesn't have the Son of God doesn't have life." (1 John 5:9-12)
For "... God, that cannot lie, promised..." (Titus 1:2), so that if we believe what He has said about how to be saved, then we can be assured that we have it, as certainly as the character of God cannot change! Therefore, I can be as sure that I am saved and will go to heaven, as certainly as I can trust God to keep His Word, or as certainly as God cannot change His character. "For I am the LORD, I change not; therefore ye sons of Jacob are not consumed." (Malachi 3 :6)
This gives great assurance to the emotional, uncertain, or those with sensitive consciences. Their salvation is as assured, as God Himself is unchangeable! "For if our heart condemn us, God is greater than our heart, and knows all things." (1 John 3:20) His promises in Christ are greater than our changeable circumstances and feelings.
So, if we have extended faith in the correct promises of God regarding salvation, we can KNOW we are saved!
"For by grace you are saved, through faith, and that not of yourselves. It is the gift of God, not of works , lest any man should boast." (Ephesians 2:8,9)
"For God so loved the world, that He gave His only begotten Son, that whosoever believes in Him should not perish, but have everlasting life." (John 3:16)
What If I Sin Accidentally Right Before the Coming of God?
We are told that we should be "Looking for that blessed hope, and the glorious appearing of the great God and our Savior Jesus Christ." (Titus 2:13) We should long for the time when we will hear the shout, "Come up hither!" At that time we have the promise "...we know that , when he shall appear, we shall be like him; for we shall see him as he is." ( 1 John 3:2) On the basis of this promise we are exhorted, "And every man that has this hope in him purifies himself, even as he is pure." (1 John 3:3)
So, in anticipation that the Lord might come at any time, we should live soberly, righteously, and godly in this present evil world. We want to be found pleasing to Him when He appears! To this end we keep short accounts with the Lord - confessing sin when we become aware of it (1 John 1:9); repenting of wrong attitudes, motives, or short comings when the Lord brings them to our attention, and ever pressing on to be more pure (as a bride decked out in her white gown), in preparation for His presentation of Himself to us. If we sin just before He appears, we are confident in His promises of acceptance, and that His sacrifice was complete for all our sins - past, present, and future. This would include any unwitting sins before He comes again. Remember, all our sins were future when He died for us! :) And His sacrifice was sufficient for ALL our sins. (Hebrews 10:14)
What If I Am "Spiritually Asleep" When He Comes?
This question touches on the basis of our salvation. Is it based on how well we live our lives. Is our acceptance dependent on our consistency? Do our "ups and downs" make us "in and out?"
Salvation is likened to being "born again" (John 3); an adoption (Galatians 4:5; Ephesians 1:5); being united to the True Vine (John 15); made part of Christ's Body (1 Corinthians 12), and similar analogies tend to show the permanence of salvation to its recipients. Can we be unborn; unadopted; torn from the Vine; ripped from the Body of Christ? Some would say yes. But the real issue here is, "Do we play a part in our salvation?" Is it, ultimately, dependent on us and our good works? Or, is it outside of ourselves, because we could never earn it or deserve it, and wholly dependent on God and His grace? Salvation is ALL of God!
Therefore, if we are "spiritually asleep" when He comes, we may suffer the judgment of believers described in 1 Corinthians 3, and lose our reward, and be saved "yet as by fire", but God will not deny His own - those bought by precious blood! Our concern would be for those whose faith was dead, because it was never alive, and they only professed that which they never possessed. (James 2)