The only knowable Truth.

In the classic thought experiment of Rene Descartes it is argued, through the use of a Grand Deceiver, that the only thing that we can truly know is that we think. I think, therefore I am. Everything else can be denied as being the work of the Grand Deceiver. The only thing that we cannot deny is that we think.

This is indeed very true. As individuals, all we can know is ourselves and nothing else. Our experiences with the world around us is through our senses, on which we rely to function in the world. We have five in total and through the information we gather from these senses we interpret the world that we inhabit.

But how much can we rely upon these senses? We might have a condition like colour blindness which means that we will doubt certain information that our sight presents us with. We might be deaf, at which point we gain no information from our hearing at all. In these cases, we discount the information (or lack of it) and compensate accordingly.

But what if we do not have such a deficiency in our senses? What if we feel we are able to rely upon them? What happens if we are told that what our senses are telling us is wrong?

This is a difficult position to be in. If we are told that one of our senses is giving wrong information then we can fall back onto medical science to have it checked. Could it not be that there is a deficiency in that sense that we do not know about? This will lead us into a situation where we can correct the information from this sense in future situations.

The situation is more complicated when we are told that in a situation two of our senses have failed us. Our senses are, in essence, independent of each other. Each one gives us different information, from which we build our picture of the world. If one of these senses fails us in a given situation then we have the other four to rely upon. But if two of the five fails us then what then?

How is it possible to function in the world when we cannot rely upon these two senses that, up to that point, we have always been able to rely upon? We have never had cause to doubt them before. They have always provided us with reliable information up to that point. Or have they?

And this is the problem. Doubt. Doubting of the information that we have received. If we cannot rely upon this information then where are we? We are back where we started. All we can know is that we think and that is it. We cannot rely upon anything else since our senses may well be deceiving us.

We know that we think, and that is all. We can only know our own thoughts and nothing else. Everything else can be denied. Nothing else can be trusted to be true.

The only truth in the world is that we think. Everything else is just interpretation. An opinion. A viewpoint. Nothing more.

No matter what happens in our lives, we must always be truly alone. It is the only thing that can be known. The only thing that can be held to be true.

I think, therefore I am, and nothing more.