```r
library(tidytext)

text_df %>%
  unnest_tokens(word, text)
```

```
## # A tibble: 20 x 2
##     line word   
##    <int> <chr>  
##  1     1 because
##  2     1 i      
##  3     1 could  
##  4     1 not    
##  5     1 stop   
##  6     1 for    
##  7     1 death  
##  8     2 he     
##  9     2 kindly 
## 10     2 stopped
## # … with 10 more rows
```