One may ask why Indra was so angry? There are 1000s of Indra yajnas all over the world. No one in the Svarga has ever seen him so angry. Though he has 1000 eyes he was blinded and could not see Krsna. The intoxication that blinded him was not wine or honey, but false ego.
The moment you are proud, you lose your vision.
Humility grants perception of reality.
In the words of the Bhagavatam, “the earth appears spinning due to one’s spinning his eyes around” – that happens due to pride. Pride comes