False ego / Ahankar

Kshudram hridaya daurbalyam , it was said to arjuna to give up the moha[ illusion ] and also arjuna said to krsn, buddhim mohayaseeva me .
But after speaking the whole gita krsn said , Yadahankaaram aashritya , so there is AHANKAR [ false ego ] which is said to be the main cause of all evils and can not be uprooted even by listening gita and here comes the role of SATSANG .
GOSWAMIJI writes about tam abhiman or false ego [ ahankar ]

mohamµula bahu sµula prada tyagahu tam abhiman,
bhajahu rama raghunayaka kripa sindhu bhagavana.
bahuri sakra sama binavau tehi, santata suranika hita jehi.
bachana bajra jehi sada piara, sahasa nayana para dosa nihara.

Other definition of ahankar is told in sri bhagwatam as twelveth vratti [ function ] and moha being as eleventh .
ekâdasâsan manaso hi vrttaya
âkûtayah panca dhiyo 'bhimânah
mâtrâni karmâni puram ca tâsâm
vadanti haikâdasa vîra bhûmîh
gandhâkrti-sparsa-rasa-sravâmsi
visarga-raty-arty-abhijalpa-silpâh
ekâdasam svîkaranam mameti
sayyâm aham dvâdadam eka âhuh

There are five working senses and five knowledge-acquiring senses. There is also the false ego. In this way, there are eleven items for the mind's functions. the objects of the senses [such as sound and touch], the organic activities [such as evacuation] and the different types of bodies, society, friendship and personality are considered by learned scholars the fields of activity for the functions of the mind.Sound, touch, form, taste and smell are the objects of the five knowledge-acquiring senses. Speech, touch, movement, evacuation and rati are the objects of the working senses. Besides this, there is another conception by which one thinks, "This is my body, this is my society, this is my family etc" and so forth. This eleventh function, that of the mind, is called the false ego [ AHANKAR ] . According to some philosophers, this is the twelfth function, and its field of activity is the body.