Difference between knowledge (VEDA) and the Truth (YOG)
Yog can discover or witness all the (thought based) knowledge but knowledge cannot discover Yog. All thoughts are echo or reflections like how an observer sees an object or event. But that light which carries the thoughts (to and fro) is itself thoughtless and is neither originated from those observed objects nor the observers. In absence of that light or thoughtless Truth, objects or events can never make themselves visible because carrier of thoughts no longer is present.
Light is 100% transparent and so is the truth. Colors or appearances of an object or experience of an event are equivalent of thoughts which we perceive, and often react in order to speculate future ( called knowledge) and start creating endless multiplication ( using various logic and memory) of thoughts.
To meditate at source of the truth is connection with the self. This bath of thoughtless energy of truth is unpolluted by senses and mind and intellect. This is yoga.
Truth is ever accessible or never denied or never reacted. This is a reason senses and mind are not used to it. Senses or mind react to disturbances or any changes which also mean thoughts but cannot react to the truth which is undisturbing and unchanged. Truth is like wife who is always at home and not get noticed but girlfriend or enemy is always remembered and get alerted.
Atma experiences the supreme light of truth or thougthless media and with that light .... senses and mind become active, refective and start producing thoughts. Truth is like full moon and senses and mind are tidal waves from ocean. Moon (truth) never expects anything from ocean (mind and body) but ocean by itself become thoughful.