Verdict
It is not in Annie Besant's work
Quoted as from My Path to Atheism or The Gospel of Atheism (1877). It could not be located in the text of My Path to Atheism digitised at Project Gutenberg; it may come from the pamphlet The Gospel of Atheism, not consulted. Unverified.
What they did say
Verified words of Annie Besant
«Yoga is the rational application of the laws of the unfolding of consciousness, self-applied in an individual case.»
An Introduction to Yoga (1908), conferencia I, «La naturaleza del yoga»
«Yoga is a science, and not a vague, dreamy drifting or imagining. It is an applied science, a systematized collection of laws applied to bring about a definite end.»
An Introduction to Yoga (1908), conferencia I, «El yoga es una ciencia»
«Each definite thought produces a double effect — a radiating vibration and a floating form.»
Thought-Forms (1905, con C. W. Leadbeater), «Los dos efectos del pensamiento»
