"By Shravana, Knowledge dawns. That is the flame. By Manana, the Knowledge is not allowed to vanish. Just as the flame is protected by a wind-screen, so the other thoughts are not allowed to overwhelm the right knowledge. By Nididhyasana, the flame is kept up to burn bright by trimming the wick. Whenever other thoughts arise, the mind is turned inward to the light of true knowledge...The inquiry “Who am I?” is the Shravana. The ascertainment of the true import of ‘I’ is the Manana. The practical application on each occasion is Nididhyasana."
- Ramana Maharshi
By listening to Vedanta discourses / podcasts on this website, your doubts may be removed. What kind of doubts? "Pramana-Gata", where "Pramana" means proof. Sometimes, repeated listening may be required. For example, If you listen to the Ashtavakra Gita discourses, you should listen to all of them.