Narada Bhakti Sutra 56-60 (chapter 5 section 2 & chap 6 section 1 )

Secondary Love Divine

The lowe devotion is threefold

according to individual discrimination

or according to the type of discontent

Better than the other

each preceding one becomes nobler

 

Practice of Love-Divine

Better than all, easily attainable is devotion

because love depends on no other proof

love itself is the proof

it’s the nature of peace

because by nature it is supreme joy