Abdullah ibn mas'ud once said..
A Faajir, sees a sin like seeing a fly, so small that he thinks he can swat it anytime with his hand..
Yet a Mu'min, sees a sin like a mountain, so huge that it might squash him, if it fell on him..
Sure, easily said, easily understood.
But the main point and problem is..
Who judges the action, and sees whether its a sin or not?
Whether its big or not?
Think.For a second.
once done, and we say, its ok..its acceptable this time..a special case..then we've just thought it was a fly
once done, and we say, its NOT ok..its NOT acceptable forever..then we REGRET..we PRAY and ASK, Allah..forgive, guide, aid..then we've seen the mountain..
For You are the Almighty