Good evening Dr Sayed Mohammad Tariq Zafar, Very different; clear to me means accurate, detailed, technical. Confident means verbose, loud, but often lacking detail & preciseness & best to avoid these people to an extent. A good example, is my current battle with religious folk. They lack details, no evidence base, no science, no detail or objective follow up after praying. Yet the groups are often very or extremely verbose, loud, pushy, smothering the people they try to convince that prayer will work with their preaching, but there is a total absence or clearness in that there is no objective measurement of change, no detail or accuracy, yet they have a strange sense of being over confident that the prayers will work miracles so very strange & odd really. I've been attempting to get them to look at evidence, they need to be more clear and less confident in the garbled preaching, but because they don't have a research or science background, they don't understand & continue to be way too over confident in what they say will work. It actually has left me extremely depressed, in that my time would be better spent on research gate then listening to over confident jibberish with no science or evidence to support the practice. I think maybe sometimes miracles do occur, but religious circles have also a failure to document these cases as journal articles. If they were to do so then there is more credibility.

This was one of the articles I sent the church group; https://pubmed.ncbi.nlm.nih.gov/16569567/ which actually showed the group who had intercessory prayer was associated with a higher incidence of complications however there is little research on prayer obviously, which is why I think it is strange that they are way over confident in what they say, yet at the same time being unclear, imprecise, & un-objective which demonstrates a good example between the difference between clear and confident which was your question on this site re; communication

I feel that in order to communicate clearly, one must have confidence in his/her ideas, ability to express them and passion to stand up for those views.

These, I believe, are two different concepts yet, they overlap in a significant way: you should be confident and mentally organized to be a clear communicator.