There is nothing to know. All we have to do is to return to our original source.
We have moved far away from the original source. Now we do not know our way back. Meditation, knowledge, prayers etc are methods to return to the original source.
Nobody is sitting up there and watching you. That which you think is watching you is within you. It is within all animate and inanimate.
Bliss is not in heaven nor is it in next life. It has to be realized here now.
Ignorance is when you stand aloof. Knowledge is when you realize you are part of the whole.