There is a decision making process at work when one chooses to have faith. Therefore, faith is fundamentally a choice, or perhaps more accurately, it is a belief in that choice. When one chooses to have faith in God, for example, one is expressing the conviction that his reasoning is correct - that there is in fact a God. So he has faith in his reasons (which aren't necessarity well-thought-out). If this is true then faith in God, or anything for that matter, is faith in the self's decision making process. Wouldn't it follow then that it is impossible to justify faith in something without good reason for it? One can go on and have faith in whatever imaginary beings he pleases: but that doesn't make him right - he is ignoring steps of reason while playing the role of inventor of explanations.