It is spiritual knowledge that purifies and can solves all the problems of material life. There are more than a million verses in the scriptures of Sanatan-Dharma (known as the Vedic scriptures). One must at least study some of these verses and implemement them in life to progress in consciousness development. In other religions, they have no knowledge compared to the knowledge contained in the scriptures of Sanatan-Dharma. Also, all their true knowledge originates from the Vedic scriptures, since the Vedic scriptures are the oldest on the planet and the vastest.
“Knowledge is the ultimate perfection of self-realization. I shall explain that knowledge unto you by which the knots of attachment to the material world are cut.” (Srimad-Bhagavatam 3.26.2)
One must study the Vedic teachings and then pass onto others to spread the truth.