What is the most profitable thing in the world ?

[Guest guest]

"Lord Caitanya then inquired: What is the most profitable thing in the world, the essence of all auspicious events? Ramananda Raya replied that there is nothing as profitable as the association of pure devotees."

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(Teachings of Lord Caitanya, page 341)

[Guest guest]

"The verdict of all revealed scriptures is that by even a moment's association with a pure devotee, one can attain all success."

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(Cc. Madhya-lila, 22.54)