To show them special mercy, I, dwelling in their hearts, destroy with the shining lamp of knowledge the darkness born of ignorance.
(Bhagavad-Gita---10:11---translation).

The Lord tells Arjuna that basically there is no possibility of understanding the Supreme Truth, the Absolute Truth, the Supreme Personality of Godhead, simply by speculating, for the Supreme Truth is so great that it is not possible to understand Him or to achieve Him simply by making a mental effort. Man can go on speculating for several millions of years, and if he is not devoted, if he is not a lover of the Supreme Truth, he will never understand Kṛṣṇa, or the Supreme Truth. Only by devotional service is the Supreme Truth, Kṛṣṇa, pleased, and by His inconceivable energy He can reveal Himself to the heart of the pure devotee. The pure devotee always has Kṛṣṇa within his heart; and with the presence of Kṛṣṇa, who is just like the sun, the darkness of ignorance is at once dissipated. This is the special mercy rendered to the pure devotee by Kṛṣṇa.
(Bhagavad-Gita---10:11---purport).

Pure devotees of the Lord are more powerful than the waters of the sacred river Ganges. One can derive spiritual benefit out of prolonged use of the Ganges waters. But one can be sanctified at once by the mercy of a pure devotee of the Lord. In Bhagavad-gītā it is said that any person, regardless of birth as śūdra, woman, or merchant, can take shelter of the lotus feet of the Lord and by so doing can return to Godhead.
(Srimad Bhagavatam---1:1:15---purport).

The fruitive workers want to lord it over the material world. Similarly, a neophyte devotee foolishly thinks of accumulating some material power in exchange for devotional service. Such foolish devotees are sometimes put into difficulty by the Lord Himself. As a special favor, He may remove all material paraphernalia. By such action, the bewildered devotee is forsaken by all friends and relatives, and so he comes to his senses again by the mercy of the Lord and is set right to execute his devotional service.
(Srimad Bhagavatam---1:5:19---purport).

Intelligence engaged in My devotion cannot be thwarted at any time. Even at the time of creation, as well as at the time of annihilation, your remembrance will continue by My mercy.
(Srimad Bhagavatam---1:6:24---purport).

Revival of the dormant affection or love of Godhead does not depend on the mechanical system of hearing and chanting, but it solely and wholly depends on the causeless mercy of the Lord. When the Lord is fully satisfied with the sincere efforts of the devotee, He may endow him with His loving transcendental service.
(Srimad Bhagavatam---1:7:6---purport).

The Lord is equal to everyone, but a devotee of the Lord is more glorified because he is always in touch with the all-great. The sun rays are equally distributed, but still there are some places which are always dark. This is not due to the sun but to the receptive power. Similarly, those who are cent percent devotees of the Lord get the full-fledged mercy of the Lord, which is always equally distributed everywhere.
(Srimad Bhagavatam----1:8:6---purport).

The sun is existent in every part of the solar system, but he becomes visible at a scheduled time and so also becomes invisible at another scheduled time. Similarly, the Lord appears in this universe like the sun and again leaves our sight at another time. He exists at all times and at every place, but by His causeless mercy when He appears before us we take it for granted that He has taken His birth.
(Srimad Bhagavatam----1:10:26---purport).

By the mercy of the arca-vigraha, the form of the Lord in material elements, the devotees who are in the material world can easily approach the Lord, although He is not conceivable by the material senses.
(Srimad Bhagavatam----1:12:9---purport).

A forgetful, conditioned soul is fearful. But a liberated soul is never fearful, just as a small child completely dependent on the mercy of his father is never fearful of anyone.
(Srimad Bhagavatam----1:14:38---purport).

With the progress of the age of Kali, four things particularly, namely the duration of life, mercy, the power of recollection, and moral or religious principles will gradually diminish.
(Srimad Bhagavatam----1:16:20---purport).

Every living being is dependent on someone else because he is so made. Actually everyone is dependent on the mercy of the Supreme Lord, but when one forgets his relation with the Lord, he becomes dependent on the conditions of material nature. Renunciation means renouncing ones dependence on the conditions of material nature and thus becoming completely dependent on the mercy of the Lord. Real independence means complete faith in the mercy of the Lord without dependence on the conditions of matter. This paramahaṁsa stage is the highest perfectional stage in bhakti-yoga, the process of devotional service to the Supreme Lord.
(Srimad Bhagavatam----1:18:22---purport).