All this is described in the sacred books; and qualities and causes of things are personified and given separate names, which are intended to explain certain efforts. This is how we get an account of Jyotishtoma, which refers to ray of light, and is based on scientific knowledge.
Classification of efforts: The text of the Vedas is so composed that the same sounds (that is words, syllables or letters) have the same meaning; and that tells us that certain efforts should be regarded as primary; while others, not connected with a sacrifice or a great and good action, as secondary; because that is how they have been differentiated. Efforts which are between these two, should be regarded as neutral. This is the normal division of efforts, - because that is the character of their impelling force - and it requires no explanation. The effort that is said to occupy a middlemost place has, however, a special meaning. A neutral effort is obviously one that is devoid of any special object to be achieved; and so it may be said to be a disinterested effort; and that, as the Bhagavad Gita tells us, is of the essence of the idea of sacrifice, enabling us to act and yet be free from the taint or bondage of action.
More is explained on this subject at:
http://www.narachphilosophy.com/the_kinds_of_action_the_method_of_interpretation.htm
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