Patanjali advises yogis who wish to be free from worldly life to be constantly vigilant in order to overcome these old habits

Verse 4.27

तच्छिद्रेषु प्रत्ययान्तराणि संस्कारेभ्यः ॥२७॥

tat-chidreṣu pratyaya-antarāṇi saṃskārebhyaḥ ||27||

The thoughts that arise as obstructions to that are

from impressions.

The force of past impressions may create loopholes in the form of intellectual pride or other varying moods or modes of thought, which breach the consciousness and disturb the harmony and serenity of oneness with the pure Self.

This sutra shows a way to combat old impressions which may influence the mind and fissure it.

Patanjali cautions that even for the supreme intelligence, the subconscious samskaras may surface in this intermediate stage and sway the consciousness.

Patanjali advises yogis who wish to be free from worldly life to be constantly vigilant in order to overcome these old habits, lest their consciousness waver between the desire for perfection and actual perfection. The uninterrupted practice of yoga unconditionally vanquishes these fissures in mind, and eradicates doubts and prejudices, so that pure wisdom may shine.

In the Bhagauad Grta I I .59, Lord Krishna says that inherent desire persists as a fissure even in the most austere renunciate. Only the vision of the Supreme resolves these latent faults forever. From that moment no worldly desire or temptation can endanger the equanimity and virtue of the yogi.

PATANJALI YOGA SUTRAS