What needs to be overthrown is our steadfast clinging to the belief of distinct, self-existing phenomena, not the standpoints of the atheists or some other philosophies. Once that clinging is gone, nothing that others preach can impair our true view anymore. For no matter how eloquent they are, they cannot affect someone who has realized emptiness. The means by which one can thoroughly destroy clinging to the idea of self-existing phenomena is to generate renunciation, arouse bodhicitta and cultivate the critical view of emptiness.

Why is realization of emptiness so powerful? It is because the cause of our endless rebirth in samsara is not something external but our own views and attachment, a kind of thought actually. And thoughts can be overthrown, but not all of them. Those that are formed on a solid base with logical reasoning are very difficult to be overthrown.

Is clinging to the idea of a real self well grounded and sensible? Not so. Ever since birth, we have always had this notion of a self. Now take a look and see if this self truly exists. And how does it exist? If we examine closely, we will discover that it does not exist. But why do we have this compelling sense of a real self? The truth is that it is all just an illusion. Like when running a high fever, one may see hallucinations as real or have strange thoughts popped up in mind. This is because the causes for seeing hallucinations or having twisted thoughts are already formed such that whatever one sees or thinks is nothing but the illusions created by these causes.

- Quote from The Right View, "The Four Noble Truths—the Path Out of Samsara"