Three times John tell believers what they know. They know it not by observation, or in theory, but instinctively, because this knowledge is planted in them at conversion and has become a part of them.
Any who think that they can continue to live largely as they did before conversion, or who attempt to justify a lifestyle that is of the world – loving its music, its entertainment, its literature, its culture – think very differently to those John addresses, and have strong grounds to question whether they are converted.
Both the Received Text and the Majority Text (1995) have the reading ‘keeps himself’, while modern versions read ‘keeps him’, allowing for the possibility that the one who keeps is different to the one who is kept. Those who follow the modern text interpret this clause to mean that Christ, who was born (begotten) of God in eternity past, keeps the believer, as many other scriptures also teach. The KJV reading stresses the believer’s responsibility and God-given instinct as one who is born again, to keep himself.