Rev. Bernard Lonergan, S.J.(1904-1984), though still not commonly known, was, talent-wise, certainly one of the top thinkers of the 20th century. It takes time for his thoughts to be appreciated, developed and applied. There are already numerous web-sites and hundreds of books, articles and theses written on his ideas. He might be publicly acknowledged as one of the 100 most influential thinkers by the end of this century. For more than forty years, his works continue to nourish and challenge people, initially in seminary circles, and gradually in different universities. Boston College has been a key base for over 20 years in fostering studies of Lonergan's thought and stimulating dialogue with people in diverse fields. Insight remains one of the basic books that one needs to master if we want to reach up to Lonergan's mind, just as he reached up to the mind of Aquinas. One of the perennial issues underlying human differences is our assumptions about knowing and reality. What is it to know? Is it taking a look out there? Or do we presume that we cannot know reality? Lonergan proposed an arduous journey for all of us to become aware of what we are doing when experiencing, understanding, judging and choosing. The focus is on appropriating or gaining self-knowledge of our recurrent cognitional processes and structures in knowing. "¡Kit is essential that the notion of insight, of the accumulation of insights, of higher viewpoints, and of their heuristic significance and implications, not only should be grasped clearly and distinctly but also, in so far as possible, should be identified in one's own personal intellectual experience." (p.xx) "Thoroughly understand what it is to understand, and not only will you understand the broad lines of all there is to be understood but also you will possess a fixed base, an invariant pattern, opening upon all further developments of understanding." (p.xxviii) This is a difficult, painstaking and challenging task, not achieved just by reading from cover to cover (785 pages plus 30). Lonergan's examples from mathematics, physics, classical and statistical investigations might be a hurdle to those who don't have background in such disciplines. Insight is like the Zen master's finger pointing towards the moon. One must be careful not to get lost in the sweeping and erudite visions and constantly come back to appropriating one's own knowing processes. This is not a book for the faint-hearted. One easier introduction is Terry J. Tekippe's "What is Lonergan Up to in Insight? A Primer". Then one can go on to Flanagan's Quest for Self-Knowledge, and The Lonergan Reader, edited by the Morellis, and finally come to grapple with the full original and Lonergan's later works on Method in Theology and Macroeconomic Dynamics.