What stands out most about Gurnall's writing is his constant use of metaphorical language. Here's a good example:
Let this encourage those of you who belong to Christ: The storm may be tempestuous, but it is only temporary. The clouds that are presently rolling over your head will pass, and then you will have fair weather, an eternal sunshine of glory. Can you not watch with Christ for one hour? ... Having already bathed in the fountain of His tender mercies, how can you stand on this side of eternity, afraid to wet your feet with those short-lived sufferings which, like a little splash of water, run between you and glory? (Vol 1, Ch 3, Part 2)Gurnall is a master at making you think about truth in in fresh, new ways. Charles Spurgeon highly recommended this book, saying, "Gurnall's work is peerless and priceless; every line is full of wisdom... The whole book has been preached over scores of times, and is, in our judgment, the best thought-breeder in all our library".
Gurnall's commentary is a great read for anyone striving to better understand the Scriptures. If you're not convinced, take a look at some of his quotes listed in the Quote Index.