C.W. VIII, p. 129, by H.P. Blavatsky
When desire is for the purely abstract - when it has lost all traces or tinge of "self" - then it has become pure.
The first step towards this purity is to kill out the desire for the things of matter, since these can only be enjoyed by the separate personality.
The second is to cease from desiring for oneself even such abstractions as power, knowledge, love, happiness, or fame; for they are but selfishness after all.
Life itself teaches these lessons; for all such objects of desire are found Dead Sea fruit in the moment of attainment. This much we learn from experience. Intuitive perception seizes on the positive truth that satisfaction is attainable only in the infinite; the will makes that conviction an actual fact of consciousness, till at last all desire is centred on the Eternal.