14 As obedient children, not fashioning yourselves according to the former lusts in your ignorance: 15 But as he which hath called you is holy, so be ye holy in all manner of conversation;
English Standard Version
14 As obedient children, do not be conformed to the passions of your former ignorance, 15 but as he who called you is holy, you also be holy in all your conduct,
14 Don't lazily slip back into those old grooves of evil, doing just what you feel like doing. You didn't know any better then; you do now. 15 As obedient children, let yourselves be pulled into a way of life shaped by God's life, a life energetic and blazing with holiness.
New King James Version
14 as obedient children, not conforming yourselves to the former lusts, as in your ignorance; 15 but as He who called you is holy, you also be holy in all your conduct,
New Living Translation
14 So you must live as God's obedient children. Don't slip back into your old ways of living to satisfy your own desires. You didn't know any better then. 15 But now you must be holy in everything you do, just as God who chose you is holy.
As the traveller, the racer, the warrior, and the labourer, gathered in their long and loose garments, that they might be ready in their business, so let Christians do by their minds and affections. Be sober, be watchful against all spiritual dangers and enemies, and be temperate in all behaviour. Be sober-minded in opinion, as well as in practice, and humble in your judgment of yourselves. A strong and perfect trust in the grace of God, is agreeable with best endeavours in our duty. Holiness is the desire and duty of every Christian. It must be in all affairs, in every condition, and towards all people. We must especially watch and pray against the sins to which we are inclined. The written word of God is the surest rule of a Christian's life, and by this rule we are commanded to be holy every way. God makes those holy whom he saves.