The soul is one, but it has to serve Dharma, Artha and Kama. By simultaneous pursuit of these, great misery is occasioned.
आत्मा ह्येको हि धर्मार्थो कामं चैव निषेवते। एतैश्च विप्रयोगोऽपि दुःखं परमनन्तकम्॥