Changes

These adverse forces are connected with sexual desire. They live on the energy wasted when the act takes place. And even a thought, a mental or vital desire is sufficient to let them come in and settle in the atmosphere. Thus it is in the mind itself that the purification must take place. <ref>http://incarnateword.in/cwm/15/adverse-forces#p20</ref>

And so, purification of experience means to make the experience sincere and motiveless. To take away all one's motives of ambition and vanity, of desire, power, etc. This is called purifying the experience, making it sincere, spontaneous and not mixing it with desires and ambitions. There are spiritual ambitions, he speaks of them, and these are even the most dangerous. <ref>http://incarnateword.in/cwm/07/12-january-1955#p34</ref>