Root of the suffering in our life is – to put it very simply – the root of the cause of the problem and the suffering that we have is looking at something completely not true and mistaking it as true and thinking it is true and clinging to that. Because even in our common sense you can tell when you begin to think something not true as true you have already asked for trouble. Sooner or later you are going to get disappointed. But this is easier said than done. And the reason is we have build strong habit to think something fake as truth.