te ca hy arvÄktanayÄ nija-loka-yÄtrayÄndha-paramparayÄÅ›vastÄs tamasy andhe svayam eva prapatiá¹£yanti
te - those people not following the Vedic principles; ca - and; hi - certainly; arvÄktanayÄ - deviating from the eternal principles of Vedic religion; nija-loka-yÄtrayÄ - by a practice arrived at by their own mental concoction; andha-paramparayÄ - by a disciplic succession of blind. ignorant people; ÄÅ›vastÄḥ - being encouraged; tamasi - into the darkness of ignorance; andhe - blindness; svayam eva - themselves; prapatiá¹£yanti - will fall down.
In this connection, one may see Bhagavad-gÄ«tÄ, Chapter Sixteen, where there is a description of the downfall of the asuras (16.16 and 16.23).