brahmeti paramātmeti bhagavān iti śabdyate
"Learned transcendentalists who know the Absolute Truth call this nondual substance Brahman, Paramātmā or Bhagavān." ( Śrīmad-Bhāgavatam  1.2.11) God has His impersonal, all-pervasive feature (known as Brahman) and His localized Paramātmā feature. At the same time He is Bhagavān, which is His original, personal, transcendental form. The three are different but the same. This is the nature of God,  acintya-bhedābheda-tattva -simultaneously one and different. One who has reached the personal conception of Bhagavān has automatically reached Brahman and Paramātmā. They are all Kṛṣṇa, but there is a difference between them. They are simultaneously one and different.
Accepting knowledge from a Learned Person
Dr. Singh.  Śrīla Prabhupāda, many people have difficulty accepting God.
Śrīla Prabhupāda.  They are diseased, but they do not want to be treated. If they do not agree to be treated, that is their fault. One who is not Kṛṣṇa conscious-God conscious-is a madman. Under the power of the illusory energy-the inferior, material energy-he talks only nonsense, just like someone haunted by a ghost. You must approach a person who is learned. You must find such a person, a  guru , and surrender to him. Then question him, and whatever answers you get from him you must accept. That is the process for understanding God. You must first find the  guru ; then you must satisfy him by service and by surrendering unto him. The  guru  will explain everything. Kṛṣṇa explains in  Bhagavad-gītā  (4.34):
tad viddhi praṇipātena paripraśnena sevayā upadekṣyanti te jñānaṁ jñāninas tattva-darśinaḥ
"Just try to learn the truth by approaching a spiritual master. Inquire from him submissively and render service unto him. The self-realized soul can impart knowledge unto you because he has seen the truth."