Jesus Calling is an extremely popular book by Sarah Young. That is sad, because it is transparently un-biblical. You should be very skeptical of anyone who claims they got special revelation from God. Those are nearly certain to be mischievous at best.
As always, as Justin Peters says, if you want to hear from God, read the Bible. If you want to hear from God audibly, then read the Bible out loud. Trust God that his word will be sufficient for you, just as He promised.
Here is part a worthwhile review of Jesus Calling by Tim Challies.
We cannot miss this. As I have spoken to others about the book, I’ve heard some people say that this book is written as if Jesus is speaking to the reader. But it’s important to know that Young makes a far more audacious claim—this is Jesus speaking, through her. The messages he has given her, she now passes on to us.
This is a very good time to pause and consider this claim. Sarah is claiming some kind of new revelation from God. She is saying that God speaks to her and that she then passes these messages to others. Immediately we need to ask what she believes about the Bible. Is she claiming that these messages are equal to Scripture? That they trump Scripture?
She makes no such claim; not directly, anyway. At one point she says, “I knew these writings were not inspired as Scripture is, but they were helping me grow closer to God.” Later she says “The Bible is, of course, the only inerrant [without error] Word of God; my writings must be consistent with that unchanging standard.” But this is all she says. While she clarifies that her writings must be subservient to the Bible, she does not actually tell us what they are or how we are to regard them. Are they authoritative? Are they in any way binding on her or on us? If they are not inspired and not inerrant, what exactly are they? There are no answers forthcoming because immediately Young begins to share those words of God as daily devotionals, saying “I have continued to receive personal messages from God as I meditate on Him. The more difficult my life circumstances, the more I need these encouraging directives from my Creator.”
Young teaches that though the Bible is inerrant and infallible, it is insufficient.
James Montgomery Boice once said that the real battle in our times would not be the inerrancy or infallibility of Scripture, but its sufficiency—are we going to rely on the Bible or will we continually long for other revelation? In Jesus Calling we see this so clearly. Young teaches that though the Bible is inerrant and infallible, it is insufficient. It was not enough for her and, implicitly, she teaches that it cannot be enough for us. After all, it was not reading Scripture that proved her most important spiritual discipline, but this listening, this receiving of messages from the Lord. It is not Scripture she brings to us, not primarily anyway, but these messages from Jesus.
On this basis alone this book is very suspect and needs to be treated with the utmost care. Young offers us words that she insists come straight from the Lord. But she gives no proof that we should expect the Lord to speak to us this way; all she offers is her own experience of it. At this point we are left with a few options. We can stop reading altogether, we can continue to read while rejecting her claims that these are words from the Lord, or we can read and take her at her word. Personally, unless reviewing the book, I would abandon it immediately. If she claims to be speaking Jesus’ words, I am no longer interested. However, for the sake of reviewing it, I continued to read.
WHAT SHE SAYS
Young offers a years’ worth of devotionals, all of which are written in the first person, as messages from Jesus. Each of them is followed with a few Scripture passages. Here is the first half of the devotional for January 8:
Softly I announce my Presence. Shimmering hues of radiance tap gently at your consciousness, seeking entrance. Though I have all Power in heaven and on earth, I am infinitely tender with you. The weaker you are, the more gently I approach you. Let your weakness by a door to My Presence. Whenever you feel inadequate, remember that I am your ever-present Help.
It is interesting that the majority of the devotionals are affirmations rather than commandments which means that the book tends to be more descriptive than prescriptive. It is less about Jesus telling how we are to live, but more about who he is, who we are, and how to enjoy his Presence. It is notable that these affirmations span only a very narrow range of the Christian experience. It is equally notable that many of Jesus’ words sound very little like what he says in the Bible. For example, “Let the Light of My Presence soak into you, as you focus your thoughts on Me.” And shortly after, “Learn to hide in the secret of My Presence, even as you carry out your duties in the world.” I do not even know what that means or how it might be applied. There is no clear command there for me to obey and no clear word about who Jesus is.
Jesus Calling is, in its own way, a very dangerous book. Though the theology is largely sound enough, my great concern is that it teaches that hearing words directly from Jesus and then sharing these words with others is the normal Christian experience. In fact, it elevates this experience over all others. And this is a dangerous precedent to set. I see no reason that I would ever recommend this book.
One of my all-time favorite lessons to teach is Decision Making and Will of God. It also addresses these alleged revelations from God.
If you really want to hear from Jesus, read the Bible. It is open 24×7.
Some quotes from the book that prove the points above.
“Smith writes, “When looking at these quotes of ‘Jesus’ from Jesus Calling, ask yourself–do these statements sound like things our Lord and Savior Jesus Christ would say?” 
According to the fake “jesus” in the Sarah Young book:
“When you trustingly whisper My Name, My aching ears are soothed.” 
“When you walk through a day in trusting dependence on Me, My aching heart is soothed.” 
This is creepy. Let’s go on to a couple more quotes from the fake “jesus.”
“Feel your face tingle as you bask in My Love-Light.” 
“Let My gold-tinged love wash over you and soak into the depths of your being.” 
“Unlike the ‘Jesus’ of Jesus Calling who does so excessively, Jesus Christ never flattered people,” writes Warren B. Smith. 
I am going to review Smith’s full book, but I probably will have short articles along the way. ‘Another Jesus’ Calling is an important book as the popular Jesus Calling seems a product of spirit dictation, like its predecessor of the 1930s, God Calling.
1. Warren B. Smith, ‘Another Jesus’ Calling, pg. 64
2. Sarah Young, Jesus Calling, pg. 203
3. Ibid., pg. 182
4. Ibid., pg. 262
5. Ibid., pg. 310
6. Warren B. Smith, ‘Another Jesus’ Calling, pg. 65