Some people think the way to Heaven is to walk the straight and narrow way, to be a follower of Jesus, to stay on the right path, live a certain way, and endure to the end. Truly, that is not the way to Heaven at all, and will actually take you to hell if that is what you believe. Jesus didn't come to put us in a position to be saved, as though it is partly Him and partly what we do ourselves to stay saved. No, He came to save us completely. He paid for our salvation in full when He died on the cross and rose again three days later, and salvation is free to anyone who will accept it by faith. It is not by walking the narrow way, but by entering in through the gate, opening the door, (being born again), and receiving the gift of eternal life. Notice, that the gift is "eternal life". If we have to do something to keep our salvation, then it wasn't eternal because eternal means forever. If it's forever, that means you can never lose it. God said it, and God cannot lie. Romans 6:23(KJV) For the wages of sin is death; but the gift of God is eternal life through Jesus Christ our Lord.
Matthew 7:13(KJV) 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.
John 10:9(KJV) I am the door: by me if any man enter in, he shall be saved, and shall go in and out and find pasture.
Could it be any clearer that salvation is by entering in, opening the door, not by staying on some type of path. You admit you are a sinner, trust Jesus with your heart to save you, and you are saved right then and there. Once you open the door, you're in forever. It's just like when Noah and his family entered the arc before the flood. Salvation is instantaneous. One minute you're lost and on your way to hell, and then the next minute, as soon as you trust Jesus with your heart, you are a child of God and on your way to Heaven. It is not some sort of process where you have to stay on the right path, follow Jesus, etc. It's the moment you open the door and let Jesus save you. Remember, "eternal life," is forever, and Jesus paid it all.