Sri Aurobindo : Lights on Yoga.

There should be no striving for power, no ambition, no selfish desire for wealth. The power or powers to come are not to be regarded as something of your own, but as gifts from the Divine. Care must be taken that there is no ambition or selfish abuse of it, that there is no pride or vanity, no sense of superiority, no entitlement or selfishness of the instrument, only a simple and purely psychic instrumentation of nature in every way in which this is suitable for the service of the Divine. (…) Stand firm in the sunlight of true consciousness - for there alone is happiness and peace. That does not depend on external events, but only on these. Sri Aurobindo, Light on Yoga

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“This Yoga implies not only the realisation of God, but an entire consecration and change of the inner and outer life till it is fit to manifest a divine consciousness and become part of a divine work. This means an inner discipline far more exacting and difficult than mere ethical and physical austerities. One must not enter on this path, far vaster and more arduous than most ways of Yoga, unless one is sure of the psychic call and of one’s readiness to go through to the end.” – Sri Aurobindo