Perhaps the most famous of these teachings are Jesus' encounter with "the rich young man" ( Matt. 19:16-22), and his saying that it is easier for camel to go through the eye of a needle than for a rich man to enter into the kingdom of God (Matt 19:23-24; Luke 18:24) - the kingdom of God which he specifically and plainly said was within us all (Luke 17:21).
Buddhist and Vedanta yoga traditions each stress the importance of non-attachment, while Judaism, Christianity and Islam each teach the importance of charity, a specific form of non-attachment. But it is perhaps the modern spiritual teacher, Jiddu Krishnamurti, who best explains why attachment to the things and people of the world are a hindrance to those who are on the path to spiritual enlightenment.
"For the rich as for the poor it is extremely difficult to find reality," Krishnamurti observed, further noting:
"The poor crave to be rich and powerful, and the rich are already caught in the net of their own action; and yet they believe and venture near. They speculate, not only upon the market, but upon the ultimate. They play with both, but are successful only with what is in their hearts. The beliefs and ceremonies, their hopes and fears have nothing to do with reality, for their hearts are empty. The greater the outward show, the greater the inward poverty."
"Self-expansion in any form, whether through wealth or through virtue, is a process of conflict, causing antagonism and confusion. A mind burdened with becoming can never be tranquil, for tranquility is not a result either of practice or of time. Tranquility is a state of understanding, and becoming denies this understanding. Becoming creates the sense of time, which is really the postpone of understanding. The "I shall be" is an illusion of self-importance."