Chapter VI Sloka 43

t« t< buiŌs<yaeg< l-te paEvRdeihkm!,
ytte c ttae -Uy> s<isŌaE kÖťnNdn.

tatra ta’ buddhisa’yoga’ 
labhate paurvadehikam | 
yatate ca tato bh®ya◊ 
sa’siddhau kurunandana ( 6|43)||

There, he comes in touch with the knowledge acquired in his former body and strives more than before for perfection, O Arjuna.
Commentary: When he takes a human body again in this world his previous exertions and practice in the path of Yoga are not wasted. They bear full fruit now, and hasten his moral and spiritual evolution.
Our thoughts and actions are left in our subconscious minds in the form of subtle Samskaras or impressions. Our experiences in the shape of Samskaras, habits and tendencies are also stored up in our subconscious mind. These Samskaras of the past birth are re-vivified and re-energised in the next birth. The Samskaras of Yogic practices and meditation and the Yogic tendencies will compel the spiritual aspirant to strive with greater vigour than that with which he attempted in the former birth. He will endeavour more strenuously to get more spiritual experiences and to attain to attain to higher planes of realisation than those acquired in his previous birth.