What is the difference between open sinfulness, oppression, and hypocrisy?

Question:
What is the difference between open sinfulness, oppression, and hypocrisy? And do they occur together?

Answer:
Answer: Open sinfulness (fisq) is the departure from obedience to Allah. It is of two types: open sinfulness of disbelief, and open sinfulness of disobedience; some open sinfulness is greater than other open sinfulness. Hypocrisy (nifaq) is likewise: major hypocrisy is doctrinal, which is displaying Islam while concealing disbelief; and practical hypocrisy, which is when a person is a believer but some of the characteristics of the hypocrites occur in him, such as lying in speech, breaking promises, and lying in speech. This is practical hypocrisy, not doctrinal hypocrisy. Repentance from it is obligatory, and it does not take one out of the religion. Disbelief (kufr) is also of two types: major disbelief, which takes one out of the religion, and minor disbelief, which does not take one out of the religion: "Do not return after me as disbelievers, striking one another's necks." This is the minor, practical disbelief, not the doctrinal disbelief that takes one out of the religion, because killing the soul, even though it is a major sin, does not take one out of the religion.