Yoga Sūtra Chapter Four verse 27

तच्छिद्रेषु प्रत्ययान्तराणि संस्कारेभ्यः ॥२७॥

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

In the breaks between that,
other psychic activity,
due to tendencies.

tat - that, thischidra - in the breaks / intervalspratyaya - psychic activityantara - othersaṃskāra - tendencies, psychological imprint, mental impression, habitual potency.

Commentaries and Reflections

TKV Desikachar:

When we act unconsciously we go back into the past.

The new is not as strong as the old.

Paul Harvey:

The past remains an eternally potent ravager into the delicacy of the present.