Simplify the following text for a Grade 7 native English-speaking person.
Original: Wills observed Lincoln 's usage of the imagery of birth , life , and death in reference to a nation `` brought forth , '' `` conceived , '' and that shall not `` perish . ''
Simplified: Wills was interested in how Lincoln used the ideas of birth , life , and death . Lincoln had described the nation as `` brought forth '' , `` conceived '' , and that shall not `` perish '' .