Is not-being-diligent the grave of opportunity?!
Answers:
TACOS!
Not necessarily, but it certainly is a problem if diligence is required for success.
However, if you want to wax poetic, then you could say that. But it is metaphorical and should not be taken literally.
The reason I say this is because diligence, by its very nature, does not allow for rest, and we need our rest. You cannot stay "on top" of things, without resting your body and mind periodically.
Maybe the crypt of opportunity. Or maybe the urn.
Seek help.