corner or pillars of faith "iman"
is To believe in Allah and His angels, His Books,His Messengers, and much good and bad, and the Last Day .
iman : feeling in heart of the existence of Allah and what we discussed and this feeling increases by doing what allah ask you to do and stop what he ask you to stop , decreases by doing what allah ask you to stop doing it and to stop doing what allah ask you to do .
nifaq is to hide what in your heart and to show what is not .
who try to show that he is muslim and do good thing for show only not for god example for nifaq :
but if you hate some one and you don't show him that you hate him is
example for not nifaq .