Answer by Suminda Sirinath S. Dharmasena for What are signs of the three marks of existence?

There are 2 types of signs:

1. Gross
2. Subtle

Many of the gross realities many intelligent people can deduce. It is the subtle ones they cannot deduce though logic. E.g. If you ask any one "Can I live for ever?", they would respond "No".

At the subtle level is what you need to see through meditation. Everything arises and passes away. (Udayawaya nana) You just have to see this to realise impedance. What arises you cannot control hence non self. What ever feeling that arises passesaway hence all feelings are unsatisfactory.

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