From “Verse 14” of Ramana Maharshi’s Ulladu Narpadu: 

English translation: If the first person exists, second and third persons will exist. If, oneself investigating the reality of the first person, the first person ceases to exist, second and third persons coming to an end, the nature that shines as one alone is oneself, the state of oneself. (trans. Michael James and Sri Sadhu Om)

But does the ego exist? 

a) We can’t discover whether it does or does not by thinking about it because thinking is downstream of whatever ego is.

b) Then how? We need to go to the experience of ego, of rising I. This Ramana terms “the I-thought.” 

c) Now what? Well, we won’t get anywhere if we go with insentience, with mere form (jada). Form will only give us another object. Therefore, we need to hold onto “the subject pole,” but that turns out to be just “the consciousness part.” 

d) At which point, our question really boils down to this: Is the consciousness part limited or unlimited? 

e) The amazing discovery is that consciousness is unlimited. Atmananda would elegantly say: What mind seems to be is just consciousness apparently limited. When the apparent limitation is removed from mind, then consciousness shines as itself. In other words, mind as such or ego as such does not really exist. Only consciousness actually exists.

f) When it’s understood that only consciousness is, then it’s clear that there are no objects (i.e., “second and third persons will [cease to] exist”).