“When one cultivates strong concentration by means of tranquility or insight meditation, the mind is no longer distracted by thoughts and other hindrances. Such pure concentration, continuously focused on an object for either tranquility or insight, is considered mental purification. A mind associated with such concentration is also purified of hindrances due to the power of the concentration.”
Source: Manual of Insight (1945), p. 45
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Mahasi Sayadaw 13
Burmese Buddhist philosopher 1904–1982Related quotes

“The powers of the mind are like the rays of the sun when they are concentrated they illumine.”
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The Mahābhāṣya

The Yoga Sutras of Patanjali, Book III, 2013
Context: Samyama, which is the application of concentration (dharana), meditation (dhyana), and superconscious trance (samadhi) in lightning succession, is practiced with the intent to gain specific knowledge of the object of concentration. The object is seen from all sides, in all its aspects, with full depth and breadth. As such, this complete absorption of the mind using the process of samyama brings complete and specific knowledge of the object. This power of knowing is vibhuti. (Bk. III, Sutra 4, p.7)

“There, where the mind concentrates the positive frequency of its thoughts, vitality is born.”
Original: (it) Là, dove la mente concentra la frequenza positiva dei suoi pensieri, nasce vitalità.
Source: prevale.net