I see people who get impatient or angry, using swear words to express their feelings. Impatience and anger may be difficult to manage, but surely swearing can be controlled if one is serious enough about it. Basically, they hurt themselves. Not only does their blood pressure rise, they also sentence themselves to undergoing more severe purification in purgatory should they be bound for heaven. We must realize that every time we sin, we actually hurt the Lord! Then there are some who in following their own will would use the excuse that they cannot help it because God made them that way. If they truly believe in that, then it's blaming God for keeping them the way they are and worse yet, believing that he cannot help them. At any rate, the cause in both above cases is lack of humility. Be filled with pride and you easily keep the Lord away.