By the end of her life, HPB made an intense effort to emphasize the importance of the practical application of Ethics in everyday life.
More important that all the profound and abstruse theosophical teachings, she made very clear that, in its essence, Theosophy is "Divine ethics".
We learn that ethics is the art of plant good karma.
In her last work, "The Key to Theosophy", one can read:
THEOSOPHIST - A true Theosophist ought "to deal justly and walk humbly."
ENQUIRER - What do you mean by this?
THEOSOPHIST - Simply this: the oneself has to forget itself for the many selves.
"Men have been deceived and deluded long enough; they must break their idols, put away their shams, and go to work for themselves — nay, there is one little word too much or too many, for he who works for himself had better not work at all; rather let him work himself for others, for all. For every flower of love and charity he plants in his neighbor's garden, a loathsome weed will disappear from his own, and so this garden of the gods — Humanity — shall blossom as a rose. In all Bibles, all religions, this is plainly set forth — but designing men have at first misinterpreted and finally emasculated, materialised, besotted them. It does not require a new revelation. Let every man be a revelation unto himself. Let once man's immortal spirit take possession of the temple of his body, drive out the money-changers and every unclean thing, and his own divine humanity will redeem him, for when he is thus at one with himself he will know the 'builder of the Temple.'"
Best regards, Magda.
 "The Key to Theosophy" by H.P. Blavatsky, The Theosophy Company, Los Angeles, California, U.S.A., 1987, pp. 52, 53