The real fiber which is preliminary for entering into the spiritual realm of God is the art of surrender and discipline is the prerequisite to learn the art of surrender.
Pure devotees of Lord are associates of Lord. To associate means to surrender unto them and surrender means to follow their instructions.
The ultimate surrendering object is Krishna.
We are not here for happy material life, we are here to serve and surrender.
One only has qualification to receive instruction from guru where one surrenders.
Surrenderance is the substance of devotional service.