Our senses are the intermediaries between the outside world and ourselves. Through eyes we link up with the visual field outside, through ears we connect with the world of sound, though skin is touch, through nose smell and though tounge is the taste.
Mind is also considered a type of sense organ, which links us with the world of thoughts and emotions.
This ability to ‘sense’a particular sense at any moment gives rise to ‘I’. Seeing creates Seer, act of observation creates observor, thought creates thinker and so on.
When I say, I am reading; Who is ‘I’ who is reading?
‘I’ provides a sense of continuity. When I say, I am reading ; I become a reader at that moment. Next moment when I am writing, the same ‘I’ becomes a writer. This sameness of ‘I’ never changes till death. This ‘I’ gives us the identity and a sense of ‘personal time’; a time that starts with our birth and finishes with our death.
The difficulty with this sense of ‘I’ (or ‘personal time’) is; though this feeds on other senses and outside world, but unlike other senses this doesn’t connect us with the outside world in a wholesome way. This takes in only what suits its purpose (and survival) i.e. identity and continuity.
Unwholesome perception is the genesis of illusion. Believing illusions is ignorance.