I have to speak candidly to be of value, but I do not want to offend the Muslim community... I think we were progressing very nicely until the surge of Islam came, and if you asked me for my observations, the other communities have easier integration – friends, inter-marriages and so on – than Muslims... I would say, today, we can integrate all religions and races, except Islam.

From his book 'Lee Kuan Yew: Hard Truths to Keep Singapore Going' (Asia One, March 08 2011)

MM Lee: I stand corrected