Guru Nanak says that if you are so blessed that you can sit and listen to the Master, no other sadhna, no other practice is needed. That is far out.
But you have to be available. And most people want to do it the yogi way, through a lot of sadhna, effort, practice, meditation. But he is just hinting: there is a much easier way. But then you have to be out of your head, you have to be available on a deeper level. And this happening can happen very spontaneously, effortlessly.
“Listen,” Nanak says. “Through listening, devotees attain bliss, and all sins and sorrows are destroyed.”
So go on emptying yourself, so you can really listen.