I am inclined to think that there is no life on other planets. I have heard repeatedly the statements about the sheer size of the universe and the correlative theoretical quantity of planets, among which it is as near a statistical certainty as possible that many can support life and consequently that one does. Yet precisely this mathematical certainly disinclines me to believe that there is life beyond Earth. I am not saying that there isn't or that it would bother me if there were; only that I am choose not to suppose that there is.
The reason is, therefore, clearly not rational. It is not, however, strictly speaking irrational, which would imply a failure to rationally derive an argument for a proposition. Instead, it is contrarational. Having divined and accepted the rational argument that there is life on other planets, I formulate my belief in conscious opposition to that. What justifies such a contrarational position? It is precisely that beauty, joy, sublimity (or some other vague and subjective term) exist in contrast to rationality.
Again, this is not to say that the rational cannot be beautiful or incite joy or embody the sublime. It merely acknowledges what has been a well recognized feature of art and literature and romance and life. The human spirit is enlivened more by the unpredictable, the unexplainable, and the impossible-but-actual than by the reasonable. Serendipity and providence. Mad, stupid, consumptive, doomed love. Fantasies and phantasmagoria and psychosis.
I believe in a beautiful God, one Who transcends and can therefore contradict reason. The notion that this foolish Deity could have created a world which by its very nature speaks to the mathematical certainty of life on other plants and then refuse to populate any planet but this one fills me with an inexplicable joy in the mere possibility of it. I will rejoice in a God who creates and saves the inhabitants of other worlds as well, but until I know otherwise I prefer to be seized by the sublime belief in a universe that must and a God who flouts such necessity.