Thomas Berry states that Dhyana, is "sustained attention" and the "application of mind to the chosen point of concentration". Dhyana is contemplating, reflecting on whatever "Dharana" has focused on. If in the sixth limb of yoga one is concentrating on a personal deity, Dhyana is its contemplation. If the concentration was on one object, Dhyana is non-judgmental, non-presumptuous observation of that object. If the focus was on a concept/idea, Dhyana is contemplating that concept/idea in all its aspects, forms and consequences. Dhyana is uninterrupted train of thought, current of cognition, flow of awareness.