<p>3:3 <em>And everyone that has this hope purifies himself, even as He is pure</em>- The purification or cleansing is by the Spirit; 'purify' and 'pure' are from the same word translated &quot;Holy&quot; as in &quot;Holy Spirit&quot;. The function of the Holy Spirit is to purify / cleanse us. Our purifying of ourselves according to His purity is impossible in our own strength; it can only be achieved by allowing His spirit to purify us towards His own purity. As noted on Jn. 15:2, the Father cleanses or purifies us through the work of the Spirit. This process comes to its final term when we are made completely &quot;pure&quot; in the change of nature and total personality envisaged in :1,2.</p>