Gems from Paramahamsa Yogananda-3:

Anxiety and Stress:

The disturbance of mental equilibrium, which results in nervous disorders, is caused by continutous states of excitement or excessive stimulation of the senses. Indulgence in constant thoughts of fear, anger, melancholy, remorse, envy, sorrow, hatred, discontent, or worry; and lack of the necessities for normal happy living, such as right food, proper exercise, fresh air, sunshine, agreeable work and purpose in life, all are the causes of nervous disease.

Gems from Paramahamsa Yogananda-2:

We should learn how to visualize our thoughts – how to recharge them with the energy of concentration until they become visible manifestations. Proper visualization by the exercise of concentration and will power enables us to materialize thoughts, not only as dreams or visions in the mental realm, but also as experiences in the material realm. – “Man’s Eternal Quest” by Sri Sri Paramahamsa Yogananda.

Gems from Paramahamsa Yogananda-1:

Very simply, all you have to do is to think away the thoughts you want to destroy, by replacing them with constructive thoughts. This is the key to heaven; it is in your hands.