saha saṅkathayan hariḥ
smayamāna uvāca tam
bhagavān prahasan priyam
prekṣan khalu satāṁ gatiḥ
According to Śrīla Śrīdhara Svāmī, the words sarva-bhūta-mano-’bhijña indicate that since Lord Kṛṣṇa knows the minds of everyone, He could tell at once that His friend Sudāmā had brought some flat rice for Him and was ashamed to present it. According to Śrīla Viśvanātha Cakravartī’s further explanation of this verse, Lord Kṛṣṇa smiled at this moment, thinking “Yes, I am going to make you show what you brought for Me.” His smile then turned to laughter as He thought, “How long are you going to keep this precious gift hidden in your cloth?”
Kṛṣṇa glanced toward the bundle hidden inside His friend’s garment, telling Sudāmā by His loving glance, “The veins showing through your emaciated skin and your ragged clothes astonish everyone present, but these symptoms of poverty will last only until tomorrow morning.”
Although Lord Kṛṣṇa is Bhagavān, the supreme, independent Lord, He is always pleased to reciprocate with those who are priya, His cherished servants. As the indulgent patron of the brāhmaṇa class, He especially enjoys favoring brāhmaṇas who are additionally qualified by unconditional devotion to Him.