Chapter 12 · The Yoga of Devotion · Krishna said
Bhagavad Gita 12.8 — Fix your mind on Him
मय्येव मन आधत्स्व मयि बुद्धिं निवेशय। निवसिष्यसि मय्येव अत ऊर्ध्वं न संशयः ॥
mayyeva mana ādhatsva mayi buddhiṃ niveśaya | nivasiṣyasi mayyeva ata ūrdhvaṃ na saṃśayaḥ ||
Meaning
Fix your mind on me alone and rest your understanding in me. Then, without doubt, you will live in me from then on.
In today's life
Gently bringing the mind back to God through the day is the simplest form of spiritual practice.