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Śrī-Caitanya-caritāmṛta
I can only pray to Kṛṣṇa that He will be pleased with you.' Thus Īśvara Purī, by the grace of his spiritual master, Śrī Mādhavendra Purī, became a great devotee in the ocean of love of Godhead.' Śrīla Viśvanātha Cakravartī states in his  Gurvaṣṭaka  prayer,  yasya prasādād bhagavat-prasādo yasyāprasādān na gatiḥ kuto'pi : "By the mercy of the spiritual master one is benedicted by the mercy of Kṛṣṇa. Without the grace of the spiritual master one cannot make any advancement." It is by the mercy of the spiritual master that one becomes perfect, as vividly exemplified here. A Vaiṣṇava is always protected by the Supreme Personality of Godhead, but if he appears to be an invalid, this gives a chance to his disciples to serve him. Īśvara Purī pleased his spiritual master by service, and by the blessings of his spiritual master he became such a great personality that Lord Caitanya Mahāprabhu accepted him as His spiritual master.
Śrīla Īśvara Purī was the spiritual master of Śrī Caitanya Mahāprabhu, but before initiating Lord Caitanya he went to Navadvīpa and lived for a few months in the house of Gopīnātha Ācārya. At that time Lord Caitanya became acquainted with him, and it is understood that he served Śrī Caitanya Mahāprabhu by reciting his book,  Kṛṣṇa-līlāmṛta . This is explained in  Caitanya-bhāgavata ,  Ādi-līlā , Seventh Chapter.
To teach others by example how to be a faithful disciple of one's spiritual master, Śrī Caitanya Mahāprabhu, the Supreme Personality of Godhead, visited the birthplace of Īśvara Purī at Kāmarhaṭṭy and collected some earth from his birthsite. This He kept very carefully, and He used to eat a small portion of it daily. This is stated in the  Caitanya-bhāgavata , Chapter Twelve. It has now become customary for devotees, following the example of Śrī Caitanya Mahāprabhu, to go there and collect some earth from that place.
TEXT 12
मिङात्तिच्छानक्त्य माली हङ्का ऋक् हम् ।
सकल शाशार सेहे ऋक् मूलाञ्चम् ॥ ५२ ॥
nijācintya-śaktye mālī hañā skandha haya sakala śākhāra sei skandha mūlāśraya
SYNONYMS
nija —His own;  acintya —inconceivable;  śaktye —by potency;  mālī —gardener;  hañā —becoming;  skandha —trunk;  haya —became;  sakala —all;  śākhāra —of other branches;  sei —that;  skandha —trunk;  mūla-āśraya —original support.
TRANSLATION
By His inconceivable powers, the Lord became the gardener, the trunk and the branches simultaneously.
TEXTS 13-15
পরমানন্দ পুরী, আর কেশব ভারতী ।
ব্রহ্মানন্দ পুরী, আর ব্রহ্মানন্দ ভারতী ॥ ১৩ ॥