You need to know what you believe. You need to know your faith with that same precision with which an IT specialist knows the inner workings of a computer. You need to understand it like a good musician knows the piece he is playing. Yes, you need to be more deeply rooted in the faith than the generation of your parents so that you can engage the challenges and temptations of this time with strength and determination. You need God’s help if you want to resist the blandishments of consumerism, if your love is not to drown in pornography, if you are not going to betray the weak and leave the vulnerable helpless.

Pope Emeritus Benedict XVI
from the introduction to the Youcat.