27. All knowledge including the 'I am' is formless, throw out the 'I am' and stay put in quietude.

The root of all knowledge is the 'I am', it's the starting point and it is formless, hence all knowledge is formless. By repeated efforts go back to this knowledge 'I am', catch hold of it and throw it out. The 'I am' is slippery and will evade your efforts, but persist and stabilize in the silence and stillness that prevails on its departure.