Concerning the bolded....that is what the bible teaches.......
Concerning those who labor n the word 1st Corinthians 3<---some have works of wood, hay and stubble, some have works of gold, silver and precious stones....both are saved, both have works tried, one is left with purified gold, silver and precious stones after the dross is burnt off, the other left naked and shamed, yet still saved "yet so as by fire"
Crowns to be won by service, martyrdom, service out of love etc.
Those faithful over a few things made ruler over many
The word MISTHOS (REWARD) is pay or wages for service rendered
The parable of the talents
etc......God is faithful, our salvation is secure and eternal in Christ. After salvation we are rewarded for service....in God's kingdom as in any kingdom there will be the ruled and those who rule (some are given rule over cities-->And he said unto him, Well, thou good servant: because thou hast been faithful in a very little, have thou authority over ten cities.) There will be those with crowns, those without, some wealthy, some lacking, etc.....through and through we see this principle seen....even with JESUS we see this truth...HE was 100% faithful and as God's SON gets IT ALL and we even see there is a place PREPARED for someone to SIT at the right hand and left hand of CHRIST on his throne.....
That is the point of many verses that are erroneously applied unto salvation....it is not about the loss of salvation after one has been given salvation, but rather our eternal reward and inheritance in the kingdom....By faithful service we are rewarded greatly, and those who are not faithful or who serve less their eternal reward in God's kingdom will be less, but their BIRTH by faith is eternally secure....