I beleive I originally copied that specific version from
here (can't remember for sure...what I posted was from a plain text version I keep on my computer). A similar version can be found in
The New Schaff-Herzog Encyclopedia of Religious Knowledge, Vol. IX: Petri - Reuchlin by Philip Schaff.
Since you obviously voiced a disagreement with the language, would you care to cite your source lest we be confused over some difference in translations?
This is from the The New Schaff-Herzog Encyclopedia of Religious Knowledge site: "ART. V. ? That those who an incorporated into Christ by a true faith, and have thereby become partakers of his lifegiving spirit, have thereby full power to strive against Satan, sin, the world, and their own flesh, and to win the victory, it being well understood that it is ever through the assisting grace of the Holy Ghost; and that Jesus Christ assists them through his Spirit in all temptations, extends to them his hand; and if only they are ready for the conflict. and desire his help, and are not inactive, keeps them from falling, so that they, by no craft or power of Satan, can be misled, nor plucked out of Christ's hands, according to the word of Christ, John x. 28: "Neither shall any man pluck them out of my hand." But whether they are capable, through negligence, of forsaking again the first beginnings of their life in Christ, of again returning to this present evil world, of turning away from the holy doctrine which was delivered them, of losing a good conscience, of becoming devoid of grace, that must be more particularly determined out of the Holy Scriptures before we ourselves can teach it with the full persuasion of our minds."
The version you cited earlier was from the other site, which has some subtle, but significant differences.
The The New Schaff-Herzog Encyclopedia of Religious Knowledge site reflects more my understanding of the Remonstrant position on eternal security. That 'version', at worse, seems to indicate that there is no solid Biblical support for the position that one could lose his/her salvation; although it does imply that there might be the possibility that one could lose their Salvation through a later rejection of the faith.
In reality, this is hardly different that a Reformed church's proceeding to excommunicate wayward members. then there is the argument that maybe those who reject their faith were never 'Saved' to begin with. Such a question is limited to either the Reformed position or a more arminian one.
A Reformed person might say that such a person was never really 'Saved,. An Arminian might say the same thing; and some Arminians may or may not claim that another possibility is that one can lose their Salvation.