Śrīmad-Bhāgavatam · Text 10.10.14
Who is speaking and story frame
यथा कण्टकविद्धाङ्गो जन्तोर्नेच्छति तां व्यथाम् ।
जीवसाम्यं गतो लिङ्गैर्न तथाविद्धकण्टक: ॥ १४ ॥
yathā kaṇṭaka-viddhāṅgo
jantor necchati tāṁ vyathām
jīva-sāmyaṁ gato liṅgair
na tathāviddha-kaṇṭakaḥ
By seeing their faces, one whose body has been pricked by pins can understand the pain of others who are pinpricked. Realizing that this pain is the same for everyone, he does not want others to suffer in this way. But one who has never been pricked by pins cannot understand this pain.
Read Śrīla Prabhupāda's purport on Vedabase.io