By H. P. Blavatsky
Now it is a fundamental doctrine of Theosophy that the “separateness” which we feel between ourselves and the world of living beings around us is an illusion, not a reality. In very deed and truth, all men are one, not in a feeling of sentimental gush and hysterical enthusiasm, but in sober earnest. As all Eastern philosophy teaches, there is but ONE SELF in all the infinite Universe, and what we men call “self” is but the illusionary reflection of the ONE SELF in the heaving waters of earth. True Occultism is the destruction of the false idea of Self, and therefore true spiritual perfection and knowledge are nothing else but the complete identification of our finite “selves” with the Great All. It follows, therefore, that no spiritual progress at all is possible except by and through the bulk of Humanity. It is only when the whole of Humanity has attained happiness that the individual can hope to become permanently happy – for the individual is an inseparable part of the Whole.
Hence there is no contradiction whatever between the altruistic maxims of Theosophy and its injunction to kill out all desire for material things, to strive after spiritual perfection. For spiritual perfection and spiritual knowledge can only be reached on the spiritual plane; in other words, only in that state in which all sense of separateness, all selfishness, all feeling of personal interest and desire, has been merged in the wider consciousness of the unity of Mankind.
This shows also that no blind submission to the commands of another can be demanded, or would be of any use. Each individual must learn for himself, through trial and suffering, to discriminate what is beneficial to Humanity; and in proportion as he develops spiritually, i.e., conquers all selfishness, his mind will open to receive the guidance of the Divine Monad within him, his Higher Self, for which there is neither Past nor Future, but only an eternal NOW. . . .
So far from being the most important, happiness in this life of matter is of as little importance in relation to the bliss of true spiritual life as are the few years of each human cycle on earth in proportion to the millions and millions of years which each human being spends in the subjective spheres, during the course of every great cycle of the activity of our globe.
With regard to faculties and talents, the answer is simple. They should be developed and cultivated for the service of Humanity, of which we are all parts, and to which we owe our full and ungrudging service.
— from “Theosophical Articles and Notes” p. 203-204 (Original Source: “Lucifer” Vol. 4, p. 88)