probability เหมือนชีวิต

A basic assumption of probability theory is that given enough information, the status of any event can be reduced to a certainty. Randomness is therefore the absence of information, and therefore subjective. The probability distributions we assign to events always represent our own lack of information; someone with different information would assign different probabilities. Another way to say it is that all probabilities are conditional probabilities. In many derivations, these conditions are omitted for brevity, but it is important to remind oneself that the conditions are still there.

source: http://research.microsoft.com/~minka/papers/nuances.html