Intellect plays a crucial role in transcending old habits . Once intellect decide with full conviction anything can be transformed.
It’s the intellect only which help in decision making from brushing your teeth to any big decision in life. Love and harmonal changes also play important role , but 90 percent of decisions are made through intellect.
Intellect is boss of body , mind and senses. Intellect purify all three of them through discipline and practice. Once purification reach at its peak then intellect too transcend . SELF who is supreme takes over intellect , SELF becomes the boss of body, mind and senses.
All habits collapse at this final stage , even every small habits also. Person borns again with totally fresh outlook. This is called reborn or second birth.
Transcend yourself for a better you.
InnerRealisation 
Too Good