Yes it one of those things a person should not leave earth without.
The key I would think would be a proper understanding as to the useage of the word keep .My two cents
If I could I would like this time to use the word Bible, the German word in place of our English word Book to try and make a point
From my experiences the word keep as to how it is defined in respect to the Bible of God it must be searched out if we are to hear God aright when rightfully dividing his "Bible of the law", described as the "Bible of prophecy" in Revelation 22. The Bible is its own dictionary in that way. Christians in order to seek the approval of God are lovenly commanded to rightly divide the book of the law the Bible and not add to it or subtract from it, seeing it can diminish or add to it another meaning
We as new creatures are given a new spirit which could never die, we can keep the law by guarding it closely watching it with all our heart, soul and mind. Christ is the only eternal Spirit that could keep them without stumbling. To violate the least is to be found guilty of violating the whole law of God, therefore doing despite to the Spirit of grace.
Strongs lexicon...5442 phulasso {foo-las'-so}
probably from 5443 through the idea of isolation; TDNT - 9:236,1280; v
AV - keep23, observe 2, beware 2, keep (one's) self 1, save 1, be ... ware 1; 30
1) to guard 1a) to watch, keep watch 1b) to guard or watch, have an eye upon: lest he escape 1c) to guard a person (or thing) that he may remain safe 1c1) lest he suffer violence, be despoiled, etc. to protect 1c2) to protect one from a person or thing 1c3) to keep from being snatched away, preserve safe and unimpaired 1c4) to guard from being lost or perishing 1c5) to guard one's self from a thing 1d) to guard i.e. care for, take care not to violate 1d1) to observe 2) to observe for one's self something to escape 2a) to avoid, shun flee from 2b) to guard for one's self (i.e. for one's safety's sake) so as not to violate, i.e. to keep, observe (the precepts of the Mosaic law)
An example. I was drafter in 1968 and eventually sent to Korea for 15 months in a artillery unit that employed 8” self propelled howitzers. While there one of the responsibilities was to keep guard with a standard as a law on a four hour watch, guarding a certain ammunition bunker that no one was allowed to enter.. We were located close enough to the dmz to be able to launch the 8’’ projectiles and hit certain strategic places along the dmz . Some say they were nuclear rounds that were reserved in case of war. We took it by faith. We guarded that by a living faith, in a living hope that kind of weapon (unseen) would guard us keep us from harm.
I believe it’s that kind of keeping, watching, the guarding of our own hearts… that we can do. We walk by the faith that does come from hearing another. His work was sufficient to fulfill His promise and provide the peace of God that surpasses all understanding.
I think the parable below reflects the idea that we are the a watchers. In Hebrew we are informed that all the saints died not receiving the promise.
Jer 51:12 Set up the standard upon the walls of Babylon, make the watch strong, set up the watchmen, prepare the ambushes: for the LORD hath both devised and done that which he spake against the inhabitants of Babylon.
. When I have time I will Judahize 
some more and share God's word with my fellow brothers and sisters in Christ. 
