तदेतदृचाऽभ्युक्तं क्रियावन्तःMundako Upanishad Part3, Chapter2, Verse10
श्रोत्रिया ब्रह्मनिष्ठाः स्वयं जुह्वत एकर्षिं श्रद्धयन्तः ।
तेषामेवैतां ब्रह्मविद्यां वदेत शिरोव्रतं विधिवद्यैस्तु चीर्णम् ॥ १० ॥
tade ta druchaabhyuktam kriyavantah
shrotriyaa brahma nisthaah swayam juhwaja ekarsim shradhayantah
tesaam ebaitaam brahma vidyaam vadet shirobratam bidhivaddaistu chirnam
Those who perform Kriya Yoga and also perform their allotted and prescribed duties as per their family, social, national, and professional status, and obey the disciplines as prescribed by the Vedas, devoted to God, perform their duties as service to God with faith, zeal, and sincerity and should be able to feel the spiritual energy on the top of their head, are qualities to study, practice and learn Brahma Vidya, the higher spiritual knowledge from the right qualified Teacher or Master. Such a person should be imparted the highest spiritual knowledge.
May you seek Him, realize Him and attain Him.
With Love and Humbleness,
Paramahansa Atmananda ji