One big difference between amateurs and true champions is that the masters are never overconfident. They never are too, too sure of themselves.
Even though they may be the best at their game, and they know and believe that ultimate victory will be theirs, they never underestimate the enemy.
Same is true of Iman. And of passion for the Deen of Allah.
Those Working for Allah may suddenly start asking themselves: Are we doing all that we possibly can do to Take This Deen to Every Home and Heart in This World?
For, that is the core of this Deen. It is the essence of being a Muslim in this world: To burn with a passion to take the Qur'an to every home and heart that needs it and which one does not.
Those Working for Allah may be consumed by this doubt, from time to time. Am I cutting corners, they will say. What stones am I leaving unturned, they will ask themselves?
The fact is that the stronger and more deep rooted the Iman, the more a person is likely to have those kind of doubts and ask: Am I doing the right thing? Am I doing enough? What am I leaving out?
How could I be doing more for Allah and his Deen?
Two things comes to mind. I wish someone will find the right Hadith references for this. But my recollection of Hadith Sharif is Muhammad, Sallallahu Alaihi wa Sallam, congratulated such people. Saying, if I recall right, that it was a sign of their Iman that these doubts come to them.
And the other thing is the example of Abu Bakr Siddique, Radiyallahu Anhu, who, one day, joined Hazrat Hanzalah, Radiyallahu Anhu, in saying: I have become a Munafiq -- a hypocrite that is.
And the two of them then march up to Muhammad, Sallallahu Alaihi wa Sallam, to share their shock and grief, only to be reassured: To the contrary; neither one of you qualifies as a Munafiq. In fact, it is your Iman that makes you feel that way.