One who adopts a presumptuous attitude in this path (tareeq) for sure drowns in deepest sea of despair!

One who is audacious in the path of the Beloved he is a thief to others (on the path) and not (a true) human being. 
The moon of self conceited attitude causes the sun (of reality) to be eclipsed. (Remember) the audacious attitude of the Satan made him accursed (forever).  
Taleem ud Deen, page 207
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The presumptuous behavior maybe a bold statement that may lead to disbelief or it maybe a false claim or an intentional involvement in sinful activity.