1. Learn where the phrase "labor of love" comes from. 

 

http://www.phrases.org.uk/meanings/222400.html

 

2. Learn where the phrase "by the skin of your teeth" comes from.

 

http://www.phrases.org.uk/meanings/83000.html

 

3.  Learn where the phrase "straight and narrow" comes from.

 

http://www.phrases.org.uk/meanings/strait-and-narrow.html

 

4.  Learn where the phrase "apple of my eye" comes from.

 

http://www.phrases.org.uk/meanings/the-apple-of-my-eye.html