No one likes moldy bread. Bread is supposed to taste great, and look appetizing. The thing is that mold doesn't start out looking bad. It starts small, in the right environment to grow mold, warm air, certain bacteria, light, etc. Your bread might look fine at first but it has a slightly soured smell, and then by the next day it starts to look funny. Eventually, it is downright disgusting. It didn't start out that way.
Have you experienced a time in your college ministry when things began to slow down? Maybe your group was growing spiritually and numerically, then things came to a slow halt, attendance dropped a little, and something just didn't seem right. What was the culprit? Sometimes it's sin.
Joshua and the Israelites experienced something similar when they crossed over into Canaan. Their courage failed and they began to feel defeated. God responds in Joshua 7:13 with these words: "Get up! Consecrate the people and say, ‘Consecrate yourselves for tomorrow; for thus says the Lord, God of Israel, “There are devoted things in your midst, O Israel. You cannot stand before your enemies until you take away the devoted things from among you.” (ESV)" There was sin in the camp. Achan had taken the devoted things and tried to hide them, and his sin was getting in the way of what God wanted to do, not just for Achan, but for Israel.
Sin can get in the way of what God wants to do in your college ministry. It can prevent the Holy Spirit from moving as He desires to move and lead your group. Left unaddressed, sin can even begin to permeate the culture of your group making it ineffective and unappetizing to spiritually hungry students.
In a relativistic culture, dealing with sin can be a challenge, but it is necessary. Our silence can be seen as permissiveness. What's more, we aren't helping students if we aren't helping them address the sin in their lives. So let's speak the truth in love, and let our students know that God's standard will be our standard because it is what is best for them.