Thematic Bible: Who purifies their soul

Behold, what charity the Father has given us, that we should be called the sons of God; therefore the world does not know us, because it does not know him. Beloved, now we are the sons of God, and it is not yet made manifest what we shall be; but we know that if he shall appear, we shall be like him; for we shall see him as he is. And every one that has this hope in him purifies himself, even as he is pure.

knowing that ye have been ransomed from your vain conversation (which you received from your fathers), not with corruptible things like silver and gold, but with the precious blood of the Christ, as of a lamb without blemish and without contamination, already ordained from before the foundation of the world, but was manifest in these last times for love of you, read more.
who by him do believe God, who raised him up from the dead and has given him glory: that your faith and hope might be in God. Having purified your souls in the obedience of the truth, by the Spirit, in unfeigned brotherly love, love one another with a pure heart fervently, being born again, not of corruptible seed, but of incorruptible, by the word of God, which lives and abides for ever.