Recognizing this oneness of life, the immanence of the one hidden Spirit in all things that exist, they realized the sanctity of all life. Not to injure anyone, not to harm anyone, not to hurt anyone, is the supreme good, supreme law. They lived to benefit life around them. In contrast, out of scientific knowledge and progress in technology, the entire world is gripped with fear, anxiety, in a state of acute anxiety neurosis, a state of uncertainty about the future and insecurity in the present. That means that due to this knowledge and its utilization, humanity has become sick.
Humanity is ill, suffering from the maladies of fear, uncertainty and insecurity.
The Upanishads say that it is because of knowledge being of two kinds. If over emphasis is laid upon the lesser knowledge, it leads to knowledge about things and ignorance about oneself, ignorance about life and the laws that prevail in the universe, the laws that govern life. Whereas, if the emphasis is laid upon the higher knowledge, para vidya , that higher knowledge liberates one from ignorance, liberates one from all that is narrow, limited, that which separates. It makes one divine by granting the knowledge that bestows the vision of the universal oneness of all life. So the Upanishads spoke about the higher knowledge and the lesser knowledge - para vidya and apara vidya .