नियमात्फलमाप्नोति न श्रेयो नियमं विना ॥
niyamāt phalam āpnoti na śreyo niyamaṁ vinā ||
(Bhaviṣya Purāṇa; cited in Hari-bhakti-vilāsa: 15.464)
“One attains the result on account of the vow [i.e., the resolution (saṅkalpa) to perform a given vrata or sevā]. Without the vow, no auspicious result comes about.”