CONVICTION

[noun] - a determined belief or fixed opinionPaul's a man of strong convictions. [C]I wouldn't say I was a non-believer, but I don't have any burning religious convictions. [C]She had a deep/firm/lifelong conviction (that) there would be a better life after death. [C + (that) clause]It's my personal conviction that all rapists should be locked away for life. [U + that clause]You can't do this kind of work if you don't have conviction about what you're doing. [U]He claimed he was enjoying his new job, but his voice lacked/didn't carry much conviction (= did not sound certain). [U]