nishtha | निष्ठा
Steadfastness towards the Guru, the path illustrated by Guru and the chosen Deity is called nishtha (Devanagari: निष्ठा ISO15919: niṣṭhā).
While performing sadhana bhakti and moving towards bhava bhakti developing steadfastness in devotion is the fifth step.
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REFERENCE
Bhakti Shatak - Hundred Gems of Devotion - an in-depth analysis