Matthew Poole's English Annotations on the Holy Bible - 1 John 5:18
The great advantage is here signified of the regenerate, who, by the seed remaining in them, {as 1 John 3:9} are furnished with a self-preserving principle, with the exercise whereof they may expect that co-operation of a gracious Divine influence by which they shall be kept, so as that wicked one, the great destroyer of souls, shall not mortally touch them, to make them sin unto death. read more
Matthew Poole's English Annotations on the Holy Bible - 1 John 5:17
He intimates they should be cautious of all sin, especially more deliberate, (which the word αδικια seems to import), but would not have them account that every sin would make their case so hopeless, as such sin, which he called sinning unto death, would do. read more