Manonasana (annihilation of the mind) is what you should strive for. You should have desire for God and nothing else. You should not get entangled in the worldly relationships. That is true wisdom. (SSS Vol.37, p. 82)
The advance of science and technology has enabled man to produce weapons of mass annihilation. Scientists who can manufacture such destructive weapons are unable to secure peace of mind. A scientist who has acquired mastery over the elements is unable to get rid of the fear that haunts him. The scientists do not enjoy the sense of peace and security experienced by common people and are wasting their lives. (SSS Vol.25, p. 44)