In Christian theology, Hell is where people go who sin (violate the laws of God) after this life. An example would be the millions killed during the last century through starvation and famine by governments trying to re-order how society, agriculture and the economy work. The people who did this honestly believed that what they were trying to accomplish was a just and moral cause, but the results were disastrous and caused a horrendous human calamity. They thought they were doing something good, but the end result was very evil.

Many people start with good intentions but somewhere on the way they go astray. A typical example would be a student in a foreign country. Very often they plan to be very diligent and work very hard, speak only the target language, etc. - These are the good intentions. But, you meet some fellow nationals, go out to a party, then another, sleep in, and little by little you forget /push aside all those good intentions. Another way to read this saying is given in the following example: Take again a very diligent student. He works hard and hardly sleeps. To stay awake and study more and give a great performance at any time he will start to take amphitamines ( a medicine to keep you awake). Little by little he becomes addicted to the amphitamines and because of his addiction loses his edge. He is in "hell" although he had the best intentions when he took the pills in the first place.