Based on Bhagavad Gita Chapter 13, Text 35
The word “cutting edge” refers literally to the sharp cutting side of the blade of a knife. Figuratively, it has come to refer to the leading position in any field. While entering into an object, the cutting edge leads the rest of the knife. Similarly, while entering into the future, those at the cutting edge of a field lead everyone else in it.
To practice devotional life, we need to cut through appearances and see the spiritual underlying the material. The intellectual sharpness that enables us to cutthrough the surface of illusion and access the substance of reality is viveka or discrimination. By this metaphysical intelligence, we can see philosophical truths that lie hidden for those who have only worldly intelligence. Their intelligence is like a knife without any cutting edge. Their inability to perceive below the surface makes them mistake the surface of reality — matter — to be the whole of reality.