Srimad-Bhagavatam: Canto 7 - Chapter 1 - Verse 8
श्रीप्रह्राद उवाचब्रह्मादय: सुरगणा मुनयोऽथ सिद्धा:सत्त्वैकतानगतयो वचसां प्रवाहै: ।नाराधितुं पुरुगुणैरधुनापि पिप्रु:किं तोष्टुमर्हति स मे हरिरुग्रजाते: ॥ ८ ॥
śrī-prahrāda uvācabrahmādayaḥ sura-gaṇā munayo ’tha siddhāḥsattvaikatāna-gatayo vacasāṁ pravāhaiḥnārādhituṁ puru-guṇair adhunāpi pipruḥkiṁ toṣṭum arhati sa me harir ugra-jāteḥ
Prahlāda Mahārāja prayed: How is it possible for me, who have been born in a family of asuras, to offer suitable prayers to satisfy the Supreme Personality of Godhead? Even until now, all the demigods, headed by Lord Brahmā, and all the saintly persons, could not satisfy the Lord by streams of excellent words, although such persons are very qualified, being in the mode of goodness. Then what is to be said of me? I am not at all qualified.
A Vaiṣṇava who is fully qualified to serve the Lord still thinks himself extremely low while offering prayers to the Lord. For example, Kṛṣṇadāsa Kavirāja Gosvāmī, the author of Caitanya-caritāmṛta, says: Thus he considers himself unqualified, lower than the worms in stool, and more sinful than Jagāi and Mādhāi. A pure Vaiṣṇava actually thinks of himself in this way. Similarly, although Prahlāda Mahārāja was a pure, exalted Vaiṣṇava, he thought himself most unqualified to offer prayers to the Supreme Lord. Mahājano yena gataḥ sa panthāḥ. Every pure Vaiṣṇava should think like this. One should not be falsely proud of his Vaiṣṇava qualifications. Śrī Caitanya Mahāprabhu has therefore instructed us: “One should chant the holy name of the Lord in a humble state of mind, thinking oneself lower than the straw in the street; one should be more tolerant than a tree, devoid of all sense of false prestige and should be ready to offer all respect to others. In such a state of mind one can chant the holy name of the Lord constantly.” Unless one is meek and humble, to make progress in spiritual life is very difficult.