When a living entity forgets his constitutional position, he prepares himself to be an enjoyer of the material resources. Sometimes he is also misguided by the thought that service to the Supreme Personality of Godhead is not absolute engagement. In other words, he thinks that there are many other engagements for a living entity besides the service of the Lord. Such a foolish person does not know that in any position he either directly or indirectly engages in activities of service to the Supreme Lord. Actually, if a person does not engage in the service of the Lord, all inauspicious activities encumber him because service to the Supreme Lord, Lord Caitanya, is the constitutional position of the infinitesimal living entities. Because the living entity is infinitesimal, the allurement of material enjoyment attracts him, and he tries to enjoy matter, forgetting his constitutional position. But when his dormant Kṛṣṇa consciousness is awakened, he no longer engages in the service of matter but engages in the service of the Lord. In other words, when one is forgetful of his constitutional position, he appears in the position of the lord of material nature. Even at that time he remains a servant of the Supreme Lord, but in an unqualified or contaminated state.
(Sri Caitanya Caritamrta---1:6:85---purport).

In the material world everyone, including Lord Śiva and Lord Brahmā—to say nothing of other demigods in the heavenly planets—is subjected to the influence of sense objects, and the only method to get out of this puzzle of material existence is to become Kṛṣṇa conscious. Lord Śiva was deep in meditation, but when Pārvatī agitated him for sense pleasure, he agreed to the proposal, and as a result Kārtikeya was born. When Haridāsa Ṭhākura was a young devotee of the Lord, he was similarly allured by the incarnation of Māyā-devī, but Haridāsa easily passed the test because of his unalloyed devotion to Lord Kṛṣṇa. As illustrated in the above-mentioned verse of Śrī Yāmunācārya, a sincere devotee of the Lord shuns all material sense enjoyment due to his higher taste for spiritual enjoyment in the association of the Lord. That is the secret of success. One who is not, therefore, in Kṛṣṇa consciousness, however powerful he may be in controlling the senses by artificial repression, is sure ultimately to fail, for the slightest thought of sense pleasure will agitate him to gratify his desires.
(Bhagavad-Gita--2:62---purport).

One may sincerely accept the path of self-realization, but the process of cultivation of knowledge and the practice of the eightfold yoga system are generally very difficult for this age. Therefore, despite constant endeavor one may fail, for many reasons. First of all, one may not be sufficiently serious about following the process. To pursue the transcendental path is more or less to declare war on the illusory energy. Consequently, whenever a person tries to escape the clutches of the illusory energy, she tries to defeat the practitioner by various allurements. A conditioned soul is already allured by the modes of material energy, and there is every chance of being allured again, even while performing transcendental disciplines. This is called yogāc calita-mānasaḥ: deviation from the transcendental path. Arjuna is inquisitive to know the results of deviation from the path of self-realization.
(Bhagavad-Gita---6:37---purport).