The first one pairs with change can be frightening. The speaker says "certain things ought to stay the way they are." This suggests they don't want change in their life.
The second pairs with "Education can make you feel less troubled." The speaker asks someone who is "troubled" if they would like to learn from people who were in the same boat.
The third pairs with "Things aren't always black and white". This is because the speaker says "People always think something is true."
The last pairs with "People can be a mystery to themselves." The speaker talks about how sometimes people cannot identify their interests until they find something that is uninteresting to them.
Hope this helped!