O King, one who accepts this process of devotional service to the Supreme Personality of Godhead will never blunder on his path in this world. Even while running with eyes closed, he will never trip or fall.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
यानास्थाय नरो राजन् न प्रमाद्येत कर्हिचित् । धावन् निमील्य वा नेत्रे न स्खलेन्न पतेदिह
yānāsthāya naro rājan na pramādyeta karhicit | dhāvan nimīlya vā netre na skhalenna patediha
SB 11.2.35