(Srila Prabhupada at Bury Place, London, England)
"It is quite evident that you are feeling anxiety in your mind. The best way to overcome this, the way to control the mind is to become Krsna conscious. This is stated in the Bhagavad gita in the sixth chapter, that one has to control the mind otherwise the mind will become his worst enemy.
The process for Krsna consciousness is that we control the mind through hearing and chanting. We hear the maha mantra, Hare Krsna Hare Krsna Krsna Krsna Hare Hare Hare Rama Hare Rama Rama Rama Hare Hare and we hear the lectures from the spiritual master and read his books.
Also we speak by preaching and by chanting. This is the easy method for controlling the mind, by hearing and chanting.
So my advice to you is to somehow or other fix your mind on Krsna then you will experience peace of mind and your mind will be your best friend."
(Srila Prabhupada letter, September 4, 1975)