Different ways one can understand / realise the Dhamma?
http://www.accesstoinsight.org/tipitaka/an/an09/an09.036.than.html

"I tell you, the ending of the mental fermentations depends on the first jhana... the second jhana... the third... the fourth... the dimension of the infinitude of space... the dimension of the infinitude of consciousness... the dimension of nothingness. I tell you, the ending of the mental fermentations depends on the dimension of neither perception nor non-perception."