yad arpitaḿ tad vikalpe
indriyaiḥ paridhāvati
rajas-valaḿ cāsan-niṣṭhaḿ
cittaḿ viddhi viparyayam
yat -- when; arpitam -- fixed; tat -- this (consciousness); vikalpe -- in material variety (the body, home, family, etc.); indriyaih -- with the senses; paridhavati -- chasing all around; rajah-valam -- strengthened by the mode of passion; ca -- also; asat -- to that which has no permanent reality; nishtham -- dedicated; cittam -- consciousness; viddhi -- you should understand; viparyayam -- the opposite (of what was previously mentioned).
In the previous verse Lord Krishna explained the auspicious results of fixing the mind in Him, and now the opposite is explained. Rajas-valam indicates that one's passion grows so strong that one commits sinful activities and reaps all types of misfortune. Although materialistic people are blind to their impending wretchedness, one can confirm by all types of evidence -- namely Vedic injunctions, direct observation, traditional wisdom and inductive logic -- that the result of violating the laws of God is disastrous.