Hebrews 10 19 Therefore, brothers, since we have confidence to enter the holy places by the blood of Jesus, 20 by the new and living way that he opened for us through the curtain, that is, through his flesh, 21 and since we have a great priest over the house of God, 22 let us draw near with a true heart in full assurance of faith, with our hearts sprinkled clean from an evil conscience and our bodies washed with pure water. 23 Let us hold fast the confession of our hope without wavering, for he who promised is faithful. 24 And let us consider how to stir up one another to love and good works, 25 not neglecting to meet together, as is the habit of some, but encouraging one another, and all the more as you see the Day drawing near.
John 3 16 “For God so loved the world, that he gave his only Son, that whoever believes in him should not perish but have eternal life.'
So clearly we do have assurance in Lord Jesus Christ and His perfect work on the cross. He is the perfect substitute for my sin, the Lamb of God. God judged Him for my sins. Jesus took the penalty for my sins, He wiped them out like they never been there. I am justified in the eyes of God because of the work of Christ on the cross.Enter ye in at the strait gate: for wide is the gate, and broad is the way, that leadeth to destruction, and many there be which go in thereat:
14 Because strait is the gate, and narrow is the way, which leadeth unto life, and few there be that find it.
Mathew 7- 13-14