Samaḥ siddhāv asiddhau ca. If you are working for Kṛṣṇa, it is Kṛṣṇa's desire if you be successful or not successful. Here it is, the word is used, asiddhau. That means don't think that because you are Kṛṣṇa conscious, you will be always successful. No. It doesn't matter. Even if you are unsuccessful, you must know it firmly that without Kṛṣṇa's desire, nothing can happen. If you are unsuccessful, then you should.... That is Kṛṣṇa conscious.... You should know also that "It is Kṛṣṇa's desire." It is Kṛṣṇa's desire. So there is no question of being depressed because you are unsuccessful. A devotee is never depressed in the horrible condition of life. Tat te 'nukampāṁ su-samīkṣamāṇo bhuñjāna... (SB 10.14.8).
Just like Prahlāda Mahārāja, he was always being put into trouble by his father, but he was never envious of his father. When he was requested by Nṛsiṁhadeva to take benediction, he refused anything for himself, but he begged to the Lord for his father." My dear Lord, my father has become envious to You; so I request You to excuse him." Just see. This is vimatsaraḥ. Suhṛdaṁ sarva-bhūtānām (BG 5.29). He was not against his father.