If you're an INFJ, three devotional practices tend to fit the way you're wired: praying in a closed room without performing, writing what you notice, and taking one impression a week to another person. The first two will come easily. The third is the one that changes things.
Jesus Said to Shut the Door
The instruction is short and it isn't about privacy for its own sake.
"But when you pray, go into your room, close the door and pray to your Father, who is unseen. Then your Father, who sees what is done in secret, will reward you" (Matthew 6:6).
The context is the verse before it, where the people praying on street corners have already been paid in full by being seen. So the closed door is not primarily about concentration. It removes the audience, and with it the temptation to be praying and performing at the same time.
That's worth knowing, because an INFJ can perform in an empty room. You'll compose a prayer in your head, notice it's a good one, revise it slightly, and arrive at something well-formed that nobody was ever going to hear. Shutting the door doesn't solve that on its own.
Practice One: Pray Badly on Purpose
So the first practice is to pray without composing it.
Say what's actually happening, in the words that come first, unedited. If a sentence is clumsy, leave it. If it doesn't resolve, don't resolve it. You'll want to tidy it and the tidying is the thing to give up.
Ten minutes of that, behind a closed door, is the whole practice. It will feel less satisfying than the version you'd have written, which is how you know it's working.
Practice Two: Write Down What You Noticed
The second uses what you do anyway.
You are running a constant read on situations and people, and most of it goes nowhere. So catch some of it. One page a day: the passage you read, and two or three sentences on what you saw in it or what it brought up about a person or a situation.
The point is not a journal you'll reread. It's that an impression which stays in your head can't be examined, and one on paper can. You'll be able to look back in a month and see which of your reads were accurate and which were you.
That's how discernment gets trained, and it can't be done entirely inside your own head.
Practice Three: Take One Thing to Somebody
The third is the one you'd skip, so it's the one to commit to.
Once a week, take one impression to another person before you act on it. What you think God is saying. What you sense about a situation at church. The thing you noticed about a friend that you were going to sit on.
Say it, ask what they think, and let them disagree with you.
An INFJ who never does this ends up with a private and untested spiritual life that feels rich from inside and has no external correction at all. That's the failure mode for this type, and it takes years, and it's avoidable with one conversation a week.
When It Goes Dry
Worth saying, since this type reads a dry stretch as a verdict.
If prayer has gone flat, your first instinct will be to examine the state of your own heart, at length. Sometimes that's right. Often the actual cause is tiredness, an overloaded month, or a season in which God is not saying much, and no amount of interior investigation will surface something that isn't there.
Keep the practice small and keep doing it. Ten minutes and one page, on the days it feels like nothing. That's the version that carries you through the stretch where the feeling has gone.
A Note on Certainty
One more thing, and it's specific to this type.
You will sometimes arrive at a conviction about a situation or a person that feels settled before you can say how you got there. Often you're right, and being right often is exactly what makes this dangerous, because you stop checking.
The practice is to hold the conviction and the timeline separately. You can be sure about what you sense and still be wrong about when, or about what you're supposed to do with it. Most of the damage this type does comes from acting immediately on something accurate.
So write it down, date it, and wait a week before doing anything about it. If it's from God it will survive seven days.
Where to Go Next
The companion piece is connecting with Jesus as an INFJ, which is about Samuel, who heard God's voice and needed an older believer to tell him whose it was.
If you want the type description itself, what it means to be an INFJ covers the four letters and the fifth one that isn't Myers-Briggs. Everything tagged for this type is collected here.
Shut the door, say the unpolished thing, write down what you saw, and tell somebody one of them this week.