darśane sparśane vāpi
darśane sparśane vāpi śravaṇe bhāṣaṇe’pi vā |
yatra dravaty antaraṅgaṁ sa sneha iti kathyate ||
(Subhāṣita-ratna-bhāṇḍāgāram)
“That wherein the inner self melts upon seeing, touching, hearing, or conversing [with someone] is called sneha (affection).”