We are of God, a holy God and that he demands from u that we be sanctified just like He is. He requires that we be pure by obedience to His commands and this sanctification is from Him alone.
(John 17:17)Keeping the word of God in our hearts, meditating and practising the same wins a pure heart before the Lord, something He is pleased with.Sanctify them in the truth; your word is truth...
Psalms 119:9-16A lying tongue, a hand that sheds innocent blood, steals or an eye that covets, a deceitful heart, all these are impurities for they are against the word. Purity cannot be derived from impurity either.... How can young people keep their way pure? By guarding it according to your word ... With my whole heart I seek you; do not let me stray from your commandments. I treasure your word in my heart; so that I may not sin against you...I will not forget your word.
In the bible where the word from the Lord is recorded we get the whole truth by which we should abide. The truth sets us free from wickedness for we know the right thing to do where and when.Who can bring a clean thing out of an unclean? (Job 14:4)
(John 8:32)Purity is a lifestyle; it goes by the way we speak, think, eat, dress, the people we hang around with, the way we act towards other people and our motives. What we do always seems right to us but God judges every our deeds.And you shall know the truth; the truth shall set you free.
(Proverbs 16:2)All one’s ways may be pure in one’s own eyes, but the Lord weighs the spirit.