Revelation 3:11-13

11 I am coming quickly; hold fast what you have, so that no one may rob you and deprive you of your crown. 

Anyone who is truly in Christ knows beyond any shadow of a doubt that Jesus is our strength. We know this because we have the Spirit of our Father dwelling within in us conforming that we are His kids and that we are sealed by Him until the day of our redemption. We understand that Jesus is greater in us then anything that is in this world and that through our Groom we are always more than conquerors. So when Jesus tells us to hold fast, we naturally look to Him. When a guest hears that they must hold fast, they look to themselves. 

12 He who overcomes (is victorious), I will make him a pillar in the sanctuary of My God; he shall never be put out of it or go out of it, and I will write on him the name of My God and the name of the city of My God, the new Jerusalem, which descends from My God out of heaven, and My own new name.

13 He who can hear, let him listen to and heed what the Spirit says to the assemblies (churches). 

Amen the door for us has been opened and because of Jesus, no man will ever shut it from us.  The glorious Truth is that we cannot even shut it. We are victorious in Christ and He is victorious in us. Jesus will absolutely keep us! 

Jesus replied, I am the Bread of Life. He who comes to Me will never be hungry, and he who believes in and cleaves to and trusts in and relies on Me will never thirst any more (at any time). John 6:35 (Even during the Great Tribulation)

And this is the will of Him Who sent Me, that I should not lose any of all that He has given Me, but that I should give new life and raise [them all] up at the last day. John 6:39

[Just as] You have granted Him power and authority over all flesh (all humankind), [now glorify Him] so that He may give eternal life to all whom You have given Him. John 17:2

No one is able to come to Me unless the Father Who sent Me attracts and draws him and gives him the desire to come to Me, and [then] I will raise him up [from the dead] at the last day. John 6:44

The path to destruction is broad. There are many churches that are on the road to destruction. The path to righteousness is narrow, because it is only through Jesus that righteousness can come. The Church of Philadelphia is kept by Jesus and amen one day all men will belong to the Church of Philadelphia. Some of us will be elders of the Church and serve. We are being enlightened and empowered now for this service and the rest of humanity will be its members. Our Father will get His wish and all men will be saved and come to the knowledge of the Truth.