Chapter VI Sloka 36

As<ytaTmna yaegae Ê:àap #it me mit>,
vZyaTmna tu ytta zKyae=vaÝumupayt>.

asaÕyat˜tman˜ yogo 
duÿpr˜pa iti me mati× | 
vaþy˜tman˜ tu yatat˜ 
þakyo'v˜ptumup˜yata× ( 6|36)||

I think Yoga is hard to be attained by one of uncontrolled self, but the self-controlled and striving one can attain to it by the (proper) means.
Commentary
Uncontrolled self: he who has not controlled the senses and the mind by the constant practice of dispassion and meditation. 
Self-controlled: he who has controlled the mind by the constant practice of dispassion and meditation. He can attain Self-realisation by the right means and constant endeavour.

xhei