Krishna says, "All beings are subject to delusive ignorance (𝙨𝙖𝙢𝙢𝙤𝙝𝙖𝙣𝙖𝙢) by the delusion of the pairs of opposites (𝙙𝙬𝙖𝙣𝙙𝙬𝙖-𝙢𝙤𝙝𝙖𝙣𝙖) springing from longing and aversion (𝙞𝙘𝙘𝙝𝙖-𝙙𝙬𝙚𝙨𝙝𝙖)" (7.27). There are two fundamental delusions we are subject to. One is caused by three 𝙜𝙪𝙣𝙖𝙨 (𝙮𝙤𝙜𝙖-𝙢𝙖𝙮𝙖) and the other by polarities of longing and aversion. When one is transcended, another is automatically crossed.
Ignorance is the first level of delusion and misery is the consequence. This misery is nothing but the pain one gets -maybe with a time lapse while chasing its polar opposite of pleasure. The next level of delusion is suppression where one gets trained to put up a brave or borrowed face to show the outside world that one is free of polarities of longing and aversion. They even look down on others and Krishna earlier termed them as hypocrites (3.6). But the reality is that these suppressions are hidden inside and come out at a weak moment.
To attain the final state of witness like a 𝙟𝙣𝙖𝙣𝙞, Krishna gives the path to overcome these delusions and says, "But those men of virtuous deeds, their sins obliterated, they, freed from the delusion of pairs of opposites, worship Me steadfastly" (7.28). It's being 𝙣𝙞𝙢𝙞𝙩𝙩𝙖 𝙢𝙖𝙩𝙧𝙖 (an instrument in the hands of all mighty) by surrendering to 𝙥𝙖𝙧𝙖𝙢𝙖𝙩𝙢𝙖.
A point to be noted is that in a given circumstance, a 𝙟𝙣𝙖𝙣𝙞 and a deluded might behave in a similar manner of ignorance or suppression but the difference is internal. 𝙅𝙣𝙖𝙣𝙞 attains an internal balance between pleasure-pain; profit-loss; victory-defeat and doesn't have any 𝙠𝙖𝙧𝙢𝙖-𝙗𝙖𝙣𝙙𝙝𝙖𝙣 (bondage of action). Deluded is imbalanced and his 𝙠𝙖𝙧𝙢𝙖-𝙗𝙖𝙣𝙙𝙝𝙖𝙣 is like writing on stone having a long lasting impact. This makes our understanding tough as examples rarely help.