Meditation is like a single log of wood. Insight and investigation are one end of the log; calm and concentration are the other end. If you lift up the whole log, both sides come up at once. Which is concentration and which is insight? Just this mind.
From the viewpoint of absolute truth, what we feel and experience in our ordinary daily life is all delusion. Of all the various delusions, the sense of discrimination between oneself and others is the worst form, as it creates nothing but unpleasantness for both sides. If we can realize and meditate on ultimate truth, it will cleanse our impurities of mind and thus eradicate the sense of discrimination. This will help to create true love for one another. The search for ultimate truth is, therefore, vitally important.
Original minds are not distinguished by being the first to see a new thing, but instead by seeing the old, familiar thing that is over-looked as something new.