Who am I?!

A very special gift from a good friend. The best part was the letter:
A sincere teacher and my brother in Christ, Andy Brown!
Happy birthday and congratulations on turning 34. When thinking of you, I think of many things happened before and after I turned back to Christ last year. When I first heard you saying about your personal history (or confession), I thought "there must be some existence who works in his life. Maybe I can find the existence that can fill my hollow chest." I didn't tell you what I was like that time when you shared with us what you were like before you met Christ, did I? In fact, I was dying, thinking about killing myself because I couldn't find anything to fill the void in my heart. Now I know what this is all about. This is how God works like changing Saul into Paul. This is how God uses his precious servant for other people who are dying, not knowing about God and the truth. I just want you to know (I bet you already know) that how much God loves you and how much you are precious in God and influencing other people in God's way. Thank God and you for giving me a second chance and letting me know the purpose of my life. I'm just sorry that my English doesn't describe how much I'm thankful to you and God who created you. Once again, Happy Happy Birthday, Andy! I hope you stay healthy and energetic like always during this final harsh semester with 6 classes. From your friend being happy for you and dreaming the day when we both speak Pure Language in Heaven. Stay cool in God!
Wow! To God be all the glory! (Luke 17:10)