Kasminnu bhagavo vigyate sarvam idam vigyatam bhavaiti
Know that by knowing which everything is known.
— Mundaka Upanishad 1.1.3
Bhaga means God
Vigyat I don’t know but is clearly about knowing as it repeats
Sarva is everything, whole
Bhava means becoming
Thus we can see the context. This is not referring to knowledge of superficial values of things. It is knowledge of wholeness or unity and of becoming, of God expressing. Only from the level of wholeness expressing can we have the big picture.
Once established, that is not lost in the details.