E.g. an emotional work like service cannot be begun either by thinking or by planning. A spiritual work like dhyana cannot be initiated by serious thought. Yoga is spiritual and can be started only in the spiritual plane, i.e. by concentration or consecration, not by discussion or thought or puja or ceremony . Mind taking initiative to think of a thing or a person is indicative of the presence of desire for that object. Desirelessness is indicated by the objects moving towards us on their own .
Conceptual understanding is only part of a full mental understanding.
It is made possible by the linguistic meaning of the words used. Fuller mental understanding requires the grasp of words from their origin, the grasp of concepts from the first principles . Understanding can be classified under mental understanding, vital understanding, physical understanding and spiritual perception. The right to tyrannize over another is human justice . Spiritual emotion is bhakti.