SB 4.9.44

athājighran muhur mūrdhni
 śītair nayana-vāribhiḥ
snāpayām āsa tanayaṁ
 jātoddāma-manorathaḥ
Synonyms: 
atha — thereupon; ājighran — smelling; muhuḥ — again and again; mūrdhni — on the head; śītaiḥ — cold; nayana — of his eyes; vāribhiḥ — with the water; snāpayām āsa — he bathed; tanayam — son; jāta — fulfilled; uddāma — great; manaḥ-rathaḥ — his desire.
Translation: 
Reunion with Dhruva Mahārāja fulfilled King Uttānapāda’s long-cherished desire, and for this reason he smelled Dhruva’s head again and again and bathed him with torrents of very cold tears.
Purport: 

By nature’s way, when a man cries, there may be two causes. When one cries in great happiness upon the fulfillment of some desire, the tears coming forth from the eyes are very cold and pleasing, whereas tears in times of distress are very hot.