I received your email just now. You can't imagine how surprise I was when you mentioned you decided to resign.
Raymond
Yes. I've made up my mind.
Stanley
Why do you want to leave ? Is it because I'm incapable ?
Raymond
No, you're not incapable. It's not about you, I found the job tiresome and my income unstable. Not to mention, I dislike having to fawn on clients for contracts.
Stanley
I am sorry to hear that. Are you sure you don't want to give this a second thought ?
Raymond
Yes. There's no need to reconsider.
Explanation :
Make up your mind - To decide
Example :I haven't made up my mind where to go yet.
I don't know what you are thinking for, but I do know that if I persist in taking a little bit time to improve my English writing every day, one of the most surprising results will be increased strength. Hence, I have made up my mind to do it.