It doesn't have to occur as this total freedom is already the case. As long as you look for it elsewhere - in a new thought structure? - in the future? - you overlook the current moment, this presence that can and will never suffer.What I will realise that I haven't got right now is total freedom from suffering. Perhaps my seeing a belief as a belief is not yet as clear as it should be for this to occur.
It really just depends what you believe yourself to be... If you are invested in the belief of being a separate self, some thing that can suffer, then yes, you seem to suffer... But when you look for this one that suffers you can't find him, can you? You only find thoughts about this entity, but not the entity...
What you always find is (just as you said): "that which in the moment knows that thought is there, that which knows the sound, the sight or any possible experience that can be". Can this knowing suffer? Or do thoughts that speak of suffering only arise "in" it? What remains when the suffering goes? This knowing presence... What is there before the suffering happens? This knowing presence... What is there when suffering seems to happen? This knowing presence...
For suffering to happen your conceptual thought mechanism has to engage and invent the sufferer, the "focus" of awareness moves onto thought and seems to get caught there for a while... this is when you seem to suffer (or are caught up in any other kind of thought story). You only have to see clearly what is happening, that you - this aware-ing presence - always remains as it is, it doesn't suffer, it doesn't really do anything. It cannot be diminished by whatever thought shows up. You are, and that's all that can be said. All the rest is story about a sufferer, a doer, a decider...
Is aware presence ever not right here/now? Does it vanish when thought arises? Does it go anywhere when the idea of a sufferer arises? Does thought touch it, change it or diminish it?
The only thing required is to get perfectly clear on what you are... are you this thought-based sufferer? Or does every thought arise in you - in this presence that never wavers? When you relax and simply look, hear, feel... Is there a continuity happening? Something that holds it all together? Not a thought stating B happened because A happened... but rather this non-conceptual knowing/being that is always present. You feel it in/as whatever you experience, you just have to look behind the description, behind the concept...

