Concentration of thought, contemplation and autosuggestion is not excluded as a technique of meditation from the purview of Preksa Meditation. In fact, it is considered as an important means of realizing the Truth. Thoughts are, no doubt, unproductive when the mind keeps on wandering and does not concentrate on a single theme. But concentrated profound thinking can result in discovering and establishing important philosophical as well as scientific doctrines and principles. Process of channelized deep thinking has always been a powerful means of discovering various facets of Reality. In Jaina literature, it is called 'Vichay Dhyana' i.e. thought-oriented or conceptual meditation. With a wandering mind, thoughts are scattered; when the mental faculty is concentrated and channelized in a single thought-process, it becomes meditation. Thus concentration of perception and concentration of thought - both qualify as valuable techniques of meditation.Whenever the former technique is used for meditation, thought is, undoubtedly, considered a distraction and is banished. But when thoughts are channelized and concentrated on a single theme, they comprise an exercise in meditation.