The most encouraging Christian book on the market right now would have to be the one that was the most encouraging yesterday, and will be the most encouraging one tomorrow and also today.
Paul wrote a letter to the Corinthians and said to them:
- You are our letter, written in our hearts, known and read by all men; being revealed that you are a letter of Christ, served by us, written not with ink, but with the Spirit of the living God; not in tablets of stone, but in tablets that are hearts of flesh. Such confidence we have through Christ toward God; not that we are sufficient of ourselves, to account anything as from ourselves; but our sufficiency is from God; who also made us sufficient as servants of a new covenant; not of the letter, but of the Spirit. For the letter kills, but the Spirit gives life. ( 2 Corinthians 3:2-6)
I could point you to some but, if you are wise, you might already know where to look.
Inspired Writers Can Only Explain What God Has Already Written Himself