Don’t be eager for experience

Do not be over-eager for experience,—for experiences you can always get, having once broken the barrier between the physical mind and the subtle planes. What you have to aspire for most is the improved quality of the recipient consciousness in you—discrimination in the mind, the unattached impersonal Witness look on all that goes on in you and around you, purity in the vital, calm equanimity, enduring patience, absence of pride and the sense of greatness—and more especially, the development of the psychic being in you—surrender, self-giving, psychic humility, devotion. It is a consciousness made up of these things, cast in this mould that can bear without breaking, stumbling or deviation into error the rush of lights, powers and experiences from the supraphysical planes. An entire perfection in these respects is hardly possible until the whole nature from the highest mind to the subconscient physical is made one in the light that is greater than Mind; but a sufficient foundation and a consciousness always self-observant, vigilant and growing in these things is indispensable—for perfect purification is the basis of the perfect siddhi.

Ref : Letters on Yoga Vol. III