“Our talks with the infidel West and our conflict with them ultimately revolve around one issue; one that demands our total support, with power and determination, with one voice, and it is: Does Islam, or does it not, force people by the power of the sword to submit to its authority corporeally if not spiritually? Yes. There are only three choices in Islam: [1] either willing submission [conversion]; or [2] payment of the jizya, through physical, though not spiritual, submission to the authority of Islam; or [3] the sword, for it is not right to let him [an infidel] live. The matter is summed up for every person alive: Either submit, or live under the suzerainty of Islam, or die.” –Osama Bin Laden
(The Al Qaeda Reader, p. 42)
And here is a quote from Dear Leader that also sums it all up: