nirgunasya hy udahrtam
ya bhaktih purusottame
laksanam—the symptom; bhakti-yogasya—of devotional service; nirgunasya—beyond the three modes of nature; hi—certainly; udahrtam—is cited; ahaituki—causeless; avyavahita—uninterrupted; ya—which; bhaktih—devotional service; purusottame—to the Supreme Personality of Godhead.
"These are the characteristics of transcendental loving service to Purusottama, the Supreme Personality of Godhead: it is causeless, and it cannot be obstructed in any way.
Link to this page: https://prabhupadabooks.com/cc/adi/4/206