Bhagavad Gita 6.25शनैः शनैरुपरमेद् बुद्ध्या धृतिगृहीतया।आत्मसंस्थं मनः कृत्वा न किञ्चिदपि चिन्तयेत् ॥

The practitioner of Yoga should attain tranillity gradually or by degrees, by,means of the intellect controlled by steadiness. The peace of the Eternal will fill the heart gradually with thrill and bliss through the constant and protracted practice of steady conentration. He should make the mind constantly abide in the Self within through ceaseless practice. If anyone constantly thinks of the immortal Self within, the mind will cease to think of the objects of sensepleasure. The mental energy should be directed along the spiritual channel by Atmachintana or constant contemplation on the Self.