OBJECTIVE BEING DESCARTES question

We are attempting to describe the everyday events in life that define reality. This becomes difficult.
The most famous line of Descartes, is I think therefore I am.

He is certain he is a thinking man. So the question becomes how does he know that he is certain? Or what knowledge is required for one to be certain of anything?

He must have a knowledge of what certainty is to answer this question. The same logic can be applied to love. To know whether one is in love, one must first have a knowledge of love to say yes or no, the answer is not relevant to the argument that the forms clearly exist.
The forms make something what they are. They are the things that make a chair a chair, a desk a desk, and so on.

So then, what if everything we knew was completely false and we really do live in the matrix? How do we know if we are living in the matrix or reality?

How do I know that the taco I'm eating really exists?

Do you exist?

Perhaps

Did you eat this morning?

Yes

Clearly you are not that skeptical because you fed yourself and you are still alive, because your reason told you that if you did not eat and drink you will die. So you employed your will to act in accordance with reason, and thus you live and continue existing.

But how do I know that the taco is not a generation of my mind and the world is just a fabrication of a bunch of aliens who use our bodies for farming organs?

The answer lies in the distinction between the imagination and how we percieve things.

Do unicorns exist?

No

The imagination can mis-lead us.

What if I really want the unicorn to exist? Does my affirmation of the dream of the unicorn and experience of the dream of the unicorn in the way I percieve the unicorn effect the existence of unicorn?

If I wish something to exist does it make it exist? Can I trust my senses that tell me the unicorn does not exist?
Clearly our senses are reliable because they exist in the objective reality as opposed to the formal reality.
When the mind experienes the percpetion of the senses through seeing and touch, the experience is affirmed in the mind that we are certainly not dreaming. To be certain of this idea, means there must a knowledge that existed before of what reality is, that is not dreaming.

We can then ask what is the cause of the this idea, or how did this idea of reality come to us to be, to be aware of the difference between sleeping and wake. Clearly the senses give us this ability through perception.

So how did we get this ability?

Birth

Who gave us birth? Our parents.
Who gave them birth? Our grandparents,
And so on to infinitude.
Who were our first parents?
Adam and Eve,
Who made them?
God

So then God must have these abilities such as being able to think and to instantiate an idea into another person. Or be able to endow someone with a set of simple idea's that are then used to employ the mind to learn. God must also by necessity then have the ability to keep himself existing since God is infinitly self-sufficient, therefor He does something like the act of eating that sustains himself ,and so we are modeled after that model.Discourse on Method and Meditations on First Philosophy