yoga vasishta ratnakaram - mumukshu prakaranam
the entrance of the realm of freedom ie moksha dwaram is protected 4 gaurds - samam vicharana santushti sadhusangama- the aspirant ie mumukshu should get in close association with atleast one guard ie should follow/attain in life then other 3 will be easily attained and allow into the world of liberation. sloka explained by sri sri sri vidya prakasananda giri swamy