Through these words, I wished to clarify to you your ideology. For it is possible that critical times await us, and the communication between me and you will be cut off for a while so that I may not be able to speak or write to you. Therefore I advise you to ponder over these words carefully, learn them by heart if you can, and accept them whole-heartedly. For behind every word lie manifold meanings.
Dear brothers, you are not a welfare organization, nor a political party, nor a local association with strictly limited aims. Rather you are a new spirit making its way into the heart of this nation - reviving it with the Qur'an; a new light dawning, dispelling the darkness of materialism through the knowledge of Allah; a resounding voice rising high - echoing the message of the Apostle (PBUH). In truth and without being excessive, you should feel that you are the bearers of a burden the rest of mankind has shrugged off. If someone asks you: "To what are you calling?" Say: "We are calling you to Islam, which was brought by Muhammad (PBUH): Government is part of it, freedom is a religious obligation." If someone should say to you: "This is politics!" Say: This is Islam, and we do not recognize such divisions.
If someone should say to you: "You are advocates of revolution!" say: "We are advocates of truth and peace - we believe and take pride in this. If you rise up against us and stand in the path of our mission, Allah has permitted us to defend ourselves, and you will be the unjust rebels." If they say to you: "You are asking the help of individuals and associations!" say: "We believe in Allah alone, and reject that which you were associating with Him." If they persist in their hostility, say: ‘Peace be unto you! We have no desire for the ignorant." (Surat-al-Qasas (28), ayah 55)
Taken from Between Today & Yesterday by Imam Hassan Al Banna