“Tatpratishedhartham-ekatattvabhyasah – To remove this (tossing and various other obstacles which stand in the way of one-pointedness of mind), the practice of concentration on one thing alone (should be made).” – Patanjali Yoga Sutras, I-32
Worldly pleasures intensify the desire for enjoying greater pleasures. Hence, the mind of worldlings is very restless. There is no satisfaction and mental peace. Mind can never be satisfied, whatever amount of pleasure you may store up for it. The more it enjoys the pleasures, the more it wants them. So, people are exceedingly troubled and bothered by their own minds. They are tired of their minds. Hence, in order to remove these botheration and troubles, the Sages thought it best to deprive the mind of all sensual pleasures. When the mind has been concentrated or made extinct, it cannot pinch one to seek for further pleasure and all botheration and troubles are removed for ever and the person attains real peace.
There is an externalizing or objectifying power in the mind. This leads to outward going thought waves The mind is drawn towards various objects. There is dissipation of mental energy, the powers of the mind, in various directions. The rays of the mind are like the rays of light, scattered in the case of worldly-minded persons. When the rays of the mind are scattered over diverse objects, you get pain. When the rays are gathered and concentrated by practice, the mind becomes concentrated and you get happiness from within.
When you see your dear friend after six years, the happiness that you get is not from the person, but from within yourself. The mind becomes concentrated for the time being and you get happiness from within your own self. When you are in favorite hill station when you are enjoying the picturesque scenery of Nature, Mountains, and Waterfalls, your mind will be suddenly upset by shock, if you receive a telegram which brings the unhappy tidings of the untimely demise of your only son. The scenery will no longer interest you. They have lost their charm for you. There is ejection of attention. There is depression. It is concentration and attention that gives you pleasure in sightseeing.
For purposes of concentration, you will have to gather the scattered rays of the mind patiently through Vairagya (dispassion) and constant practice, through renunciation and penance and then march boldly with indefatigable energy towards God or Soul. Through constant spiritual practice, the mind must be checked from externalizing. It must be made to move towards Soul, its original home. When the mental rays are concentrated, illumination begins.
Mind – Its Mysteries and Control by Sri Swami Sivananda