Can a person realize that objects even exist when they cannot perceive it? We can never be certain of anything, especially its existence when it cannot be perceived, but then again our common sense has the ability to perceive all the probability as it continues to exist, even when it does not exist.Another question is that how do we know that an object exists even when they are being perceived? The great philosopher states, surely there is no one skeptical to state that we cannot know the existence of an object that is directly perceived. Our common sense tells assures us there is an object when we directly perceive them.After reviewing Locke’s answers we come up with our own understanding of what we mean when someone says something exists. Analyzing the question in different angles concluding, when someone says a thing exists, that thing is actually being perceived. To mean that something is perceived, Esse est percipi.Certainly, things do exist when they are being perceived; this is what it means by “to be.” we tend to ask ourselves whether physical matter does exist. Well, our direct answer will be that if we can perceive it then it exists, but if it does not exist then we cannot perceive it. Thus the question draws down to, can we see physical matter?The answer to the above question might be pretty obvious, but looking at the question more closely. When we agree that we perceive physical matter, what are we claiming to perceive? For example, I see a beautiful shellfish that I picked at the beach yesterday, but then again I ask myself what am I sensing? I am sensing a hard brown etc. Hence what is actually seeing are sensations that am getting from the shellfish. Which Locke thinks they are caused by qualities. But according to Berkeley all these qualities I perceive, the sensation from the hard brown shaped shell all actually exist only in my mind and not in the external world.To think therefore I am I am, was extensively explained by Descartes. The quote is extracted from a discourse method by philosopher Rene Descartes. Since all his beliefs have deceived him before. Dreaming of God is actually deceiving the demon itself. He convinces the world that nothing is real, it is essential to believe everything is possible and can be called into question but it all runs down to none existence.“I think therefore I am” is used often in most classes, to get the students through the real meaning of the word. In our daily life routine, we can never be sure about any subject. Even the obvious truths sometimes are doubtful. Should I eat in this restaurant or not, should I forgive my friend etc. These doubts can be categorized into two sections the evil genius and the doubt. These two methods all reach a similar result: the certainty of the existence of subjectivity: thinking therefore means I am.According to Descartes the methodical doubt voluntarily questions a person’s knowledge and opinion. Thus thinking if I may, is thinking of being. It is a doubt that has put everything in question, reversing and becoming the source of certainty.The evil genius an assumption of force cheating, making one pass for a true being, misrepresented. But then again it might be wrong, when someone’s senses become a source of illusion, a fact remains that one can suspend their decision. Although a person may be wrong depending on their senses, blaming on illusions. Thereby suspending one’s decision, suspending one’s decision is a thought that comes conclusively thereby proving the existence.