The Supreme Lord, Sri Kṛṣṇa, cannot be seen by our present conditional vision. In order to see Him, one has to change his present vision by developing a different condition of life, full of spontaneous love of Godhead. When Sri Kṛṣṇa was personally present on the face of the globe, not everyone could see Him as the Supreme Personality of Godhead. Materialists like Ravana, Hiranyakasipu, Kamsa, Jarasandha, and Sisupala were highly qualified personalities by acquisition of material assets, but they were unable to appreciate the presence of the Lord. Therefore, even though the Lord may be present before our eyes, it is not possible to see Him unless we have the necessary vision. This necessary qualification is developed by the process of devotional service only, beginning with hearing about the Lord from the right sources. The Bhagavad-gita is one of the popular literatures which are generally heard, chanted, repeated, etc., by the people in general, but in spite of such hearing, etc., sometimes it is experienced that the performer of such devotional service does not see the Lord face to face. The reason is that the first item, sravana, is very important. If hearing is from the right sources, it acts very quickly. Generally people hear from unauthorized persons. Such unauthorized persons may be very learned by academic qualifications, but because they do not follow the principles of devotional service, hearing from them becomes a sheer waste of time. Sometimes the texts are interpreted fashionably to suit their own purposes. Therefore, first one should select a competent and bona fide speaker and then hear from him. When the hearing process is perfect and complete, the other processes become automatically perfect in their own way.
When Dhruva Maharaja was undergoing penance and meditating upon the form of Viṣṇu within his heart, the Viṣṇu form suddenly disappeared, and his meditation broke. Upon opening his eyes, Dhruva Maharaja immediately saw Viṣṇu before him. Like Dhruva Maharaja, we should always think of Kṛṣṇa, and when we attain perfection we shall see Kṛṣṇa before us. This is the process. We should not be too hasty. We should wait for the mature time. Of course, it is good to be eager to see Kṛṣṇa, but we should not become discouraged if we do not see Him immediately. If a woman gets married and wants a child immediately, she will be disappointed. It is not possible to have a child immediately. She must wait. Similarly, we cannot expect that just because we engage ourselves in Kṛṣṇa consciousness we can see Kṛṣṇa immediately. But we must have faith that we will see Him. We must have firm faith that because we are engaged in Kṛṣṇa consciousness we shall be able to see Kṛṣṇa face to face. We should not be disappointed. We should simply go on with our Kṛṣṇa conscious activities, and the time will come when we will see Kṛṣṇa, just as Kuntidevi sees Him face to face. There is no doubt about this.
Source : A.C. Bhaktivedanta Swami Prabhupada (2014 edition), “Teachings of Queen Kunti”, Page 148 & 208