Suffering

Anyone who can see that this unfavorable condition of life is also another favor of Kṛṣṇa… Tat te ‘nukampāṁ su-samīkṣamāṇaḥ (SB 10.14.8). ‘Even there is some suffering, it is not given by Kṛṣṇa. I am suffering on account of my past misdeeds, and Kṛṣṇa is so kind that I would have suffered many hundred thousand times more than the present suffering, but Kṛṣṇa is adjusting the whole thing by little suffering.’ This is the vision of devotee.”
(760208 – Lecture SB 07.09.01 – Mayapur)

Devotees should always be happy with all the dealings of their master, the Supreme Personality of Godhead. A devotee may be put into difficulty or opulence, but he should accept both as gifts of the Supreme Personality of Godhead and jubilantly engage in the service of the Lord in all circumstances.
(CC Adi 12.37 purport)

The Lord says “I put My devotee into difficulty, and thus the devotee becomes more purified in exchanging transcendental bhāva with Me.” Placing the devotee into material troubles necessitates delivering him from the illusory material relations. The material relations are based on reciprocation of material enjoyment, which depends mainly on material resources. Therefore, when material resources are withdrawn by the Lord, the devotee is cent percent attracted toward the transcendental loving service of the Lord. Thus the Lord snatches the fallen soul from the mire of material existence. Tribulations offered by the Lord to His devotee are different from the tribulations resulting from vicious action.
(SB 1.9.19)