Many people believe in the 'extra-biblical' saying of John Calvin, "Once Saved Always Saved". In fact, this phrase has become so indoctrinated into people that they believe this to be an actual 'biblical passage', which it is clearly not.
Salvation is a continuing process much like repentance is. Salvation is not a means to an end, it is the end that justifies the means.
In other words, if you fell off of a ocean liner in the middle of the ocean the outlook on your future life would seem dismal at best. Chances are the rest of your life would be very short and end by you drowning.
IF however someone on board of the ship spotted you in the water and threw you a life preserver, this could save your life.
We would have the freedom of choice to grab hold of the life preserver and hold on until we are out of danger.... and of course we would also have the option of not accepting the life preserver, or, after grabbing hold of the life preserver, choose to let it go
Jesus Christ is our 'Life Preserver'.
He gives us the option to accept or reject Him, however the option to reject Him seems as insane as rejecting a water rescue at Sea.
Until we pulled on board the ship we are still in the water and still in danger. We still have the option of letting go of the life preserver and there are still many obstacles we must overcome.
Jesus commands that we, having found the way to safety, tell others of the way to safety so that they may also have the option of grabbing hold.... but Salvation is only for those who accept the way to life and are willing to hang on for dear life