Any spiritual practice that is easy to overcome would barely be
considered a practice at all..
"Avaranata Sutta: Obstructions" (AN 6.86), translated from
the Pali by Thanissaro Bhikkhu. Access to Insight (Legacy Edition), 4
July 2010, http://www.accesstoinsight.org/tipitaka/an/an06/an06.086.than.html
.
"Endowed with these six qualities, a person is incapable of
alighting on the lawfulness, the rightness of skillful mental
qualities even when listening to the true Dhamma. Which six?
"He is endowed with a [present] kamma obstruction, a defilement
obstruction, a result-of-[past]-kamma obstruction; he lacks
conviction, has no desire [to listen], and has dull
discernment.
"Endowed with these six qualities, a person is incapable of
alighting on the lawfulness, the rightness of skillful mental
qualities even when listening to the true Dhamma.
"Endowed with these six qualities, a person is capable of
alighting on the lawfulness, the rightness of skillful mental
qualities even while listening to the true Dhamma. Which six?
"He is not endowed with a [present] kamma obstruction, a
defilement obstruction, or a result-of-[past]-kamma obstruction; he
has conviction, has the desire [to listen], and is discerning.
"Endowed with these six qualities, a person is capable of
alighting on the lawfulness, the rightness of skillful mental
qualities even while listening to the true Dhamma."