Dear Friends,
There are many many short sentences appearing
in the mantras of upanishads.
They can also be called as mahavakyas.
For example ahamEvEdagM sarvam || Chandogya 7-25-1
AtmaivEdagM sarvam || Chandogya 7-25-2
Atmata Eva idagM sarvam || Chandogya 7-26-1
There are many more passages of this kind.
In fact the above three vakyas , the three mantras viz. 2-1-3 & 2-1-4
of Kathopanishad and mantra 2-4 of Kena Upanishad and
Sri Shankara's commentary are more than enough for a genuine
and sincere mumukshu to be an Atmavit provided it is taught
by a Guru who has cognized/realized what he is teaching.
A sincere mumukshu can conveniently say good bye to all the prakaranagranthas and the other tarkapradhanagranthas
as he does not need them.
With respectful namaskars,
Sreenivasa Murthy.