Material existence is described as being full of miseries arising from birth, disease, old age, death, mind, weather, etc. To conquer "samsara" (the cycle of death and rebirth) and become eligible for one of the different types of "moksha" (liberation), one has to first conquer "kama" (material desires) and become self-realized. The human form of life is most suitable for this spiritual journey, especially with the help of "sadhu" (self-realized saintly persons), "sastra" (revealed spiritual scriptures), and "guru" (self-realized spiritual masters), given all three are in agreement.