Twelve Unlikely Heroes, by John MacArthur

This book really touched my heart and opened my eyes. Because it's just a G-R-E-A-T book!
If you're serving God with all your heart (and despite your heart at the same time) and somehow you feel like an 'unlikely and unfitted servant' this book will hit you right between the eyes.
Believe me!
MacArthur goes through all the Bible, founding the most unlikely heroes of the text to teach the reader the reality of God's work: If He wouldn't use the 'imperfect servants' then He couldn't use anybody!
And that is why I'm certain that you will identify with at least one of the heroes and by doing that, God will speak to your heart, comfort your soul and make you want to serve Him again.
That's what happened to me and because of that, I really wanted to share here a couple of paragraphs of the book (even I don't know if I can do it):

'God uses endless combinations of personality, cultural background, experience, and station in society to accomplish His will. He is not limited by age (Enoch lived for 365 years; John the Baptist for about 30); status (Jonathan was a prince; Onesimus was a slave); human strength (Gideon was a weak coward; Samson was supernaturally strong); or even past sins (Paul persecuted the church; John Mark was a deserter; and Jonah rebelled against God's command). (...) From the earliest points of human history (before de Flood) to the earliest points of church history (the generation after the apostles), God has been at work in the lives of His people through unlikely heroes.'

An imperfect and true servant of the Lord Jesus Christ can not afford not reading this book.
Now... Go and read!