You have to grow from the inside out. None can teach you, none can make you spiritual. There is no other teacher but your own soul.
Since, O Mazda, from the beginning, Thou didst create soul and body; mental power and knowledge and since Thou didst place life within the corporeal body and didst bestow to mankind the power to act, speak and guide, you wished that everyone should choose his or her own faith and path freely.
O Lord of all, hail unto Thee! The Soul of all, causing all acts, enjoying all, all life art Thou! Lord of all pleasure and delight!
When you do things from your soul, you feel a river moving in you, a joy.
Soul receives from soul that knowledge, therefore, not by book, nor from tongue. If knowledge of mysteries comes after emptiness of mind, that is illumination of heart.
To succeed, you must have tremendous perseverance, tremendous will. “I will drink the ocean”, says the persevering soul; “at my will mountains will crumble up”.
One who identifies himself with his soul regards bodily transmigration of his soul at death fearlessly, like changing one cloth for another.
The soul that is attached to anything, however much good there may be in it, will not arrive at the liberty of Divine union. For whether it be a strong wire rope or a slender and delicate thread that holds the bird, it matters not, if it really holds it fast; for until the cord be broken, the bird cannot fly.
Spiritual teacher enjoins us to comprehend by our soul the infinite spirit which is in the depth of the moving and changing facts of the world; the urging of our artistic nature.

