In the 9th evening's talk of the retreat, the actual title of the talk, if you have seen the book or bought the tape, is called "Doubt and Open." There is a fine line. It is OK to doubt, if we feel that something is unbeneficial, unskillful, not proper, etc. But on the other side if we actually see that the things really have no negativity around them, then our doubting will be going possibly the wrong way. So when doubts arise, try to look at the object or whatever it is that you are doubting, in every different way that you can. This will help you with your doubt.
Doubt, as I have mentioned before, is the biggest hindrance, in the sense that it can destroy practice pretty easily if you don't solve the doubt. In the scriptures, the Buddha gives an example which can be helpful here, which helps you to solve your doubt if you are all alone, because sometimes you can't, you need a friend, you need what's called a Kalyanamitta, a good wise spiritual friend. But if you are all alone, this example from the scriptures might help you.
Imagine there are twelve blind people, and they are all brought to stand around an elephant. Then they are all told to grab the elephant, and to describe what an elephant is. So one person grabs the trunk, and describes this long kind of round type thing that has holes on the end and says "that's the elephant." Another person grabs the tusk and says "no, no, the elephant is very hard and it has a point on the end, it doesn't have holes at all." Someone else grabs the tail and says "you're both wrong, the elephant is like this." Someone else grabs a foot, and so on. So all the twelve blind people describe the elephant in a different way.
None of the people have the ability to describe the elephant fully, they can only with their hands describe part of it. But if a person takes off their "blindfold," or has eyes that are strong and can see, and walks around the elephant, they can describe the elephant fully. So if you are ever getting caught in a doubt, and you don't have someone else who can help you to see other perspectives, that is walking around your elephant, if you don't have that then you have got to try to walk around the elephant. You have got to try to say, "OK, I have this doubt, but my thoughts are this, what can I imagine someone else's thoughts are about this, how can I imagine someone else would see this from a different perspective."
That is important, if you are going to try to solve doubts, you must see that a question is one thing and valid to ask, but a doubt that turns into aversion may be based on a wrong perception. So either you are going to need to talk to someone about it, someone wiser who has a different perspective, or you are going to have to try as best you can to walk around the elephant, see it from all different sides. A follow up on that is, OK, I am a man, I am fifty years old, I have a doubt, I think, "OK, how would a woman see that, how would my parents see that, how would a kid see that?" This is a way to walk around the elephant, you actually try to put yourself in someone else's position who is different to yourself, and that might help you.