Doubtful...

When you remove the element of doubt, all you’re left with is certainty.

I’m sure if I was on trail for a crime I didn’t commit, I’d PRAY that my lawyer could cast a shadow of doubt in my favor-
Aside from that, I have no room for doubt in my life.

In fact, my entire career has been based on the conviction that I could not fail.

Of course I’ve been unsuccessful at achieving every obstacle I’ve set out to conquer...
Nevertheless, I continue to operate on the basis that if I release the fear (or doubt) I will triumph. 
...and with that kind of attitude, it’s DOUBTFUL that I’ll fail!