One should never indulge in excessive affection or concern for anyone or anything; otherwise one will have to experience great suffering, just like the foolish pigeon.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
नातिस्नेहः प्रसङ्गो वा कर्तव्यः क्वापि केनचित् । कुर्वन् विन्देत सन्तापं कपोत इव दीनधीः
nātisnehaḥ prasaṅgo vā kartavyaḥ kvāpi kenacit | kurvan vindeta santāpaṃ kapota iva dīnadhīḥ
SB 11.7.52