"This happens at the beginning of salvation history when Adam and Eve disobey God's direct command not to eat the fruit from the tree of knowledge"
This quote tells us that sin has been around since the beginning of time and the first human beings even sinned against God. This quote also tells us that we sin to help ourselves and to get what we want for ourselves in Adam and Eve's case they wanted knowledge and they got it by disobeying God.
"I am the Light of the World"
This quote simply means that we should follow Christ because he is the good of the world and will show the evils that there are. It also means he will always be right and he will lead us away from the darkness of sin.
"From out the heart come evil thoughts murder, adultery, sexual immorality, theft, false testimony, and blasphemy"
This quote means that all the evil comes from ourselves and will cause us to commit many other sins. This also means that we should keep our hearts clean with our faith if we do not want to have sinful lives.
This quote tells us how sin is an offence to God and to ourselves. It tells us how sin can harm our reason and blur our conscience. When our conscience is blurred by sin then we are not able to choose the right way.
"The sum of those conditions of social life which allow social groups and their individual members ready to access their own fulfillment"
This quote tells how our social lives give us and easy access to what ever we want. In today's world we can be fulfilled anytime we want and not much is said because others are committing sin just for their pleasure.