This dhīra can be possible when we develop love for Kṛṣṇa. Then we become dhīra. Otherwise, it is not possible. Otherwise we shall be disturbed.
Premāñjana-cchurita-bhakti-vilocanena (Bs. 5.38). And how we can see God? Not with these eyes. These eyes, but there must be some ointment. That is called prema. Just like a mother sees his child, although not very beautiful, very beautiful. Because he has, she has got love for the child. Others, they are seeing the child not very beautiful. The mother, out of ecstatic love, sees the child very beautiful. So similarly, unless we have developed our love for Kṛṣṇa, we cannot see the Supreme Personality of Godhead within our heart, not only within our heart, everywhere.