Passage
Little children, let no man deceive you: he that doeth righteousness is righteous, even as he is righteous.
Little children, let no man deceive you: he that doeth righteousness is righteous, even as he is righteous.
1 John 3:5 And ye know that he was manifested to take away our sins; and in him is no sin.
1 John 3:6 Whosoever abideth in him sinneth not: whosoever sinneth hath not seen him, neither known him.
1 John 3:7 Little children, let no man deceive you: he that doeth righteousness is righteous, even as he is righteous.
1 John 3:8 He that committeth sin is of the devil; for the devil sinneth from the beginning. For this purpose the Son of God was manifested, that he might destroy the works of the devil.
1 John 3:9 Whosoever is born of God doth not commit sin; for his seed remaineth in him: and he cannot sin, because he is born of God.
The verse centers on "little", "children", "deceive", "doeth", "righteousness", and "even". It is saying that the verse draws attention to "little" and "children", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 6's "Whosoever abideth in him sinneth not whosoever..." into verse 8's "He that committeth sin is of the...", so "little" and "children" belong inside that flow. In 1 John context, the local focus is Christ, faith, and discipleship.
A plain takeaway is to answer the verse's own emphasis on "little" and "children" with trust shaped by these words, not by a vague optimism outside the passage.