I recently began to study "probability theory" in the sense of a rigorous mathematical treatment of probability in terms of measures,and etc.
But, my background in probability is really elementary, no more than a basic discrete probability, so whenever I encounter concepts like random variables, I understand the definitions, theorems and etc, but I do not really "see" them as I do not have an intuitive feel for what they really are.
Can you recommend a good book which can help me develop intuition for probability theory, possibly at the cost of being sloppy in mathematical rigour?