The Christian life is a pursuit of holiness. Here are several books I recommend on the subject of holiness.
Top Recommendation

It’s dangerous to assume that because a person is drawn to holiness in his study that he is thereby a holy man. There is irony here. I am sure that the reason I have a deep hunger to learn of the holiness of God is precisely because I am not holy. I am a profane man—a man who spends more time out of the temple than in it. But I have had just enough of a taste of the majesty of God to want more. I know what it means to be a forgiven man and what it means to be sent on a mission. My soul cries for more. My soul needs more.
Other Recommendations

It’s a modern-day classic. Follow it up with The Discipline of Grace. That makes an ideal one-two punch for a new Christian.

Spiritual Disciplines for the Christian Life
How else do we pursue holiness but through the spiritual disciplines?

Moore looks at Christ’s temptation and shows how we, like Jesus, can overcome Satan’s temptations.

A contemporary and pull-no-punches look at the challenge of holiness.

A short book, but one that packs a punch. It is a helpful examination of a particularly deceptive and odious sin and offers a biblical solution to it. Those who read it may find themselves grappling with a big problem they didn’t know they had.

you are up for a challenging but brilliant and rewarding read, try John Owen’s Overcoming Sin and Temptation. And if Owen’s own prose proves too difficult, The Devoted Mind by Kris Lundgaard and Friendship with God by Mike McKinley bring the best of his work into language that is far easier to read.