In his writings, Swami Vivikenanda (one of the first persons to bring the teachings of India to the West), asks:
"How has all the knowledge of the world been gained but by the concentration of the powers of the mind? The world," he observes, "is ready to give up its secrets if we only know how to knock, how to give it the necessary blow. The strength and the force of the blow come through concentration. There is no limit to the power of the human mind," he points out, "(t)he more concentrated it is, the more power is brought to bear on one point." (I. 130-131.)"The flow of this continuous control of the mind becomes steady," Vivikenanda notes, "when practiced day after day, and the mind obtains the faculty of constant concentration." (I. 273.)
In relation to this Swami Satchitananda cites the Sanskrit saying: Mana eva manushyanam karanam bandha mokshayoho. "As the mind, so the man; bondage or liberation are in your mind."
As an 'attitude' is only a conditioned, habitual way of thinking, the practice of yoga is unlearning such conditioned habits of thought, and thereby concentrating the mind into a focused instrument with which to probe the inner depths of one's being. For it is only in doing so that we can become capable of perceiving the All-in-All.