In plain words
But performing the sacrificial rites, yajña, yāga and the rest, or practising charity, Dharma and tapas: this is not something human beings are able to do. They called this the path of karma.
Inquiring into the eternal and the transient, recognising that the divinity that is everywhere is one alone, inquiring into the eternal and the transient, the one who tries to escape being bound in this transient world, that is, in saṃsāra: he alone is a jñānī. Controlling the senses, performing hard sādhanas, experiencing oneness and recognising divinity: that alone is the sādhana of yoga. Such hard control of the senses is not easy. Patañjali called this yogaḥ citta vṛtti nirodhakaḥ. We who cannot control our senses even for a moment, to control them for ever: what a hard task this is! It is easy to say, but hard to do. So the path of yoga, the path of karma, the path of Jñāna: for ordinary people this is impossible. Without differences of caste and creed, without difference of age, without any vows and observances, without performing hard sādhanas, the path of Bhakti alone is the sacred path to reach God by the easiest way. So they kept proclaiming to the world that to be one with God always is itself immortality. Just as fish cannot live without water, the devotee cannot live without God. He cannot stay apart from God even for a moment. The gopikās kept proclaiming the truth that this itself is the bond that cannot be broken. That is why, from that day, the gopikās bore hardships of many kinds to experience the oneness of divinity. This was called sādhya-bhakti. This was also called supreme Bhakti. This was also named ananya-bhakti. Wherever we have full faith, there Prema grows. Wherever there is Prema, there śraddhā too grows. Wherever there is śraddhā, there we gain Jñāna. Only when we gain Jñāna do we perform sādhanas. Only after sādhana is performed does the goal come about. So the foundation of sādhya-bhakti is faith. So we must foster Prema through faith alone. That is why, without both our Prema and our faith, we can never experience divinity, nor come to know it.
Night and day, never shrinking at all from hardships of any kind, the gopikās and the cowherds yearned in every way to attain Kṛṣṇa, the divine.