Thought is the natural outcome of a rational mind, and to think unavoidable, however may this not always be the case that we think and therefore act rationally. To think is also to deliberate, and thereupon to act - the fact is thought is the very first activity that leads up to action or resolve. Where thought is prerequisite as the motive for any determined action, it is useful when it takes form of reflection. If to think is unavoidable and thinking the chief determining factor as to what we do and how be perform and how we get better at doing things, then is it not better if we could think better, i.e. think through, taking into consideration all facets of a situation, all factors in cause and effect before hand and thereafter. To think critically is a way to do just that. If we are not critical in thinking, we are dumb, that, if we do not learn through experience and use thinking as our most dependable tool then we are not intelligent. The fact is we are most critical beings by nature, and most of our criticism is levelled against ourselves.
Criticism becomes insulting and harmful when it loses its objectivity, when the whole purpose of criticizing is nothing other than to denigrate, disdain, castigate, belittle, undermine and reject. I understand it is not easy to take criticism from others, but the fact is we need it, but in a way we could make good use of it, we need view and opinions of other people just as we need reflections of our own heart and mind. No one has an automatic right to criticise other. Criticism is not to be done just because it could be done regardless, is not good enough a reason. We can see this and either say, ‘you have no right to criticise me’, or, ‘thanks for your candid opinion’, I will see what I can do.