The essence of Theosophy is ...

The essence of Theosophy is the perfect harmonizing of the divine with the human in man, the adjustment of his god-like qualities and aspirations, and their sway over the terrestrial or animal passions in him. Kindness, absence of every ill feeling or selfishness, charity, goodwill to all beings, and perfect justice to others as to oneself, are its chief features. He who teaches Theosophy preaches the gospel of goodwill; and the converse of this is true also — he who preaches the gospel of goodwill, teaches Theosophy.
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 H. P. Blavatsky

Quotes from the same author

Spiritualism is but a baby now, an unwelcome stranger, whom public opinion, like an unnatural foster mother, tries to crush out of existence.
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 H. P. Blavatsky
I speak "with absolute certainty" only so far as my own personal belief is concerned. Those who have not the same warrant for their belief as I have, would be very credulous and foolish to accept it on blind faith. Nor does the writer believe any more than her correspondent and his friends in any "authority" let alone "divine revelation"!
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 H. P. Blavatsky
The possible truths, hazily perceived in the world of abstraction, like those inferred from observation and experiment in the world of matter, are forced upon the profane multitudes, too busy to think for themselves, under the form of Divine revelation and scientific authority. But the same question stands open from the days of Socrates and Pilate down to our own age of wholesale negation: is there such a thing as absolute truth in the hands of any one party or man?
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 H. P. Blavatsky
Whatever plane our consciousness may be acting in, both we and the things belonging to that plane are, for the time being, our only realities. As we rise in the scale of development we perceive that during the stages through which we have passed we mistook shadows for realities, and the upward progress of the Ego is a series of progressive awakenings, each advance bringing with it the idea that now, at last, we have reached "reality"; but only when we shall have reached the absolute Consciousness, and blended our own with it, shall we be free from the delusions produced by Maya [illusion].
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 H. P. Blavatsky
The Universe is the periodical manifestation of this unknown Absolute Essence.
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 H. P. Blavatsky