To be faithful unto death is to not give up all your life! To be faithful unto death is to be loyal, constant, the same, unwavering and unchanging until death.
As you continue in your service to the Lord, you will surely come across the occasion to stumble, to fall and to be unfaithful. Jesus even warns us in Matthew 18:7 that "… it must needs be that offences come; …" Many people run a race and get to a place where they suddenly fall and crash to the ground for one reason or the other. Stumbling blocks can make it impossible to reach the expected end. This is what you have to prevent!
Make sure you do not fall to the ground and crash out of the race. Those are the standards of our Saviour and it is important that you believe in them and practice them. This timely book by celebrated author Dag Heward-Mills, will spur you on to stay faithful until the very end.