Why do we take rebirth as an ordinary sentient being?

I have already taught something about this Basic Nature. When a thought appears from there and you look towards that thought, the thought disappears and there is a clear presence. Soon afterwards, a thought arises. If you follow the thought and immediately judge it as good or bad or something, then you forget where it is coming from, you forget the source. When you see anything, when an object arises, when for instance something interesting comes, you immediately perceive it as interesting and follow it, and that leads to desire. If on the other hand the objects are not very happy or pleasant, then that immediately makes you angry. These emotions are created very easily.

Actually the normal things we see are neither good nor bad, but we are influenced by ignorance and believe that everything exists as we see it, inherently, as an object. We don’t realize that everything is merely created by our mind, that in reality everything is empty form. That means we are following ignorance, everything is bound by ignorance. Ignorance is not very far. It is bound to all sentient beings from the beginning. Why do we take rebirth as an ordinary sentient being? Because we are bound by ignorance. You think that everything you see exists concretely, as though it were true. You don’t have any doubts at all, so that means that, like all sentient beings, you are very tightly tied up with ignorance.

From: ESSENTIAL INSTRUCTIONS on the INNERMOST ESSENCE of KUNTU ZANGPO by Shardza Trashi Gyaltsen / ཤར་རྫ་བཀྲ་ཤིས་རྒྱལ་མཚན་གྱིས་མཛད་པའི་ཀུན་ཏུ་བཟང་པོའི་སྙིང་ཏིག་གི་དོན་འགྲེལ་བཞུགས་སོ།། སློབ་དཔོན་བསྟན་འཛིན་རྣམ་དག་གིས་ཞལ་ཁྲིད། Extracted from the Oral Teachings of Lopön Tenzin Namdak Rinpoche, Paris, 10-10-2010, Trnscr. & Ed. by Carol Ermakovа & Dmitry Ermakov. (UK: FPYB, 2014).