Holiness is a part of our daily walk with God. It is just as essential as knowing who our God is and how to be saved.
Hebrews 12:14 Follow peace with all men, and holiness, without which no man shall see the Lord:
We are to be holy because God is holy.
1 Peter 1:15-16 But as he which hath called you is holy, so be ye holy in all manner of conversation; 16 Because it is written, Be ye holy; for I am holy.
What is holiness? Holiness is a separation from sin and a dedication to God (Bernard, p. 32).
Romans 12:1-2 I beseech you therefore, brethren, by the mercies of God, that ye present your bodies a living sacrifice, holy, acceptable unto God, which is your reasonable service. 2 And be not conformed to this world: but be ye transformed by the renewing of your mind, that ye may prove what is that good, and acceptable, and perfect, will of God.