1 Peter 1:14-16 - Heavenly Manna

Obey God because you are his children; don't slip back into your old
ways--doing evil because you knew no better.  But be holy now in everything
you do, just as the Lord is holy, who invited you to be his child.  He
himself has said, "You must be holy, for I am holy."
1 Pet 1:14-16 (TLB)

After people commit their lives to Christ, they usually still feel a pull
back to their old ways. Peter tells us to be like our heavenly Father--holy
in everything we do. Holiness means being totally devoted or dedicated to
God, set aside for his special use and set apart from sin and its influence.
We're to be set apart and different, not blending in with the crowd, yet not
being different just for the sake of being different. What makes us
different are God's qualities in our lives. Our focus and priorities must be
his. All this is in direct contrast to our old ways (1:14). We cannot become
holy on our own, but God gives us his Holy Spirit to help us obey and to
give us power to overcome sin. Don't use the excuse that you can't help
slipping into sin. Call on God's power to free you from sin's grip. [Life
Application SB]

Our daily expression of holiness is a reflection of our faith in Christ.  If
we have no desire to be holy, we should seriously question the genuineness
of our faith in the Lord Jesus.
Christ not only died to save us from the punishment for our sins, but also
from slavery to sin in this worldly culture.  To continue to live in sin as
a Christian is contradictory to the most basic meaning of Christianity.
Christ died to save us from our sins, not to let us remain in our sins
(Mat.1:21; 1Jo.1:6,7).  What kind of person would want to follow Christ and
not desire to live a holy life?...
Holiness, then, is not an option for the believer.  Paul wrote to Titus,
"For the grace of God has appeared for the salvation of all men, training us
to renounce irreligious and worldly passions, and to live sober, upright,
and godly lives in this world" (Tit.2:11,12).  Though holiness is not a
condition for salvation, it is the natural consequence of salvation.  We do
not become holy in order to be saved, but because we are saved.  We do not
do good works to get to heaven, but because heaven has already come into our
To trust Christ for salvation is to trust him for holiness.  If there is no
desire for holiness within, then it is doubtful that the Holy Spirit has
come to dwell within.  The Holy Spirit does not save us without giving us
the desire to live a holy life.  [Floyd McClung; Time with God devotional