1. The book says Fyodor Pavlovich would from time to time, experience a spiritual terror and a moral torment. Why do you think this happens?

Answer 1 : I think the soberness that drinks tend to give, makes him think of the bad things he has said and done to other people.

2. What would be the reason Mitya is so free with Alyosha?

Answer 2 : Probably because Mitya has no one else who would be so open to him ever in the worst situations.

3. Pride is a kin to foolishness. What do you think about that?

Answer 3 : Pride forms a line that you must not cross. And while it's good for helping you sence of justice, it may make you neglect help of others, even when you are in sore need of it.