Passage
and every one who is having this hope on him, doth purify himself, even as he is pure.
and every one who is having this hope on him, doth purify himself, even as he is pure.
1 John 3:1 See ye what love the Father hath given to us, that children of God we may be called; because of this the world doth not know us, because it did not know Him;
1 John 3:2 beloved, now, children of God are we, and it was not yet manifested what we shall be, and we have known that if he may be manifested, like him we shall be, because we shall see him as he is;
1 John 3:3 and every one who is having this hope on him, doth purify himself, even as he is pure.
1 John 3:4 Every one who is doing the sin, the lawlessness also he doth do, and the sin is the lawlessness,
1 John 3:5 and ye have known that he was manifested that our sins he may take away, and sin is not in him;
The verse centers on "having", "hope", "doth", "purify", "himself", "even", and "pure". It is saying that the verse draws attention to "having" and "hope", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 2's "beloved now children of God are we..." into verse 4's "Every one who is doing the sin...", so "having" and "hope" 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 "having" and "hope" with trust shaped by these words, not by a vague optimism outside the passage.