I’m looking to create a recording of about 50 affirmations, spaced apart from each other. However, I often pause and return to recording, which results in some affirmations being significantly louder than others. Additionally, I sometimes want to copy and paste recordings from different sessions, which can also have varying volume levels. This inconsistency makes it difficult to play them together since some are too quiet while others are too jarring. I’ve tried loudness normalization, but it didn’t help. Is there another method to make all my voice recordings have a consistent volume? I use background music. Thanks 
Audacity won’t tell you the current LUFS loudness but you can use the YouLean Online Loudness Meter before you change it.
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Thank you for your answer, I’ll look into this
-Update: very helpful, appreciated! 
Doug: Audacity’s Loudness Normalization under Effects >> Volume & Compression allows specifying loudness either in RMS or LUFS terms. For pigletinblanket, if each affirmation were in a separate track, would applying the same LUFS loudness normalization to all tracks yield equal perceived loudness across all tracks?
Yes… approximately. That’s the idea of LUFS. If the tracks are “similar” (like they are all male spoken voice) RMS should work just as well.
But human perception is complicated and if one person adjusted two or more tracks to the same loudness by ear, another person might not agree. 
I must confess that I’m quite new to using Audacity. To clarify what I mean I was wondering if there’s a way to adjust the overall loudness to make all the recordings more uniform. That said, I’m perfectly willing to go through each section individually to adjust the loudness as needed. I was trying to upload a screenshot, but it seems I’m unable to do so. The recordings are all displayed on the same timeline, bar (?), although I’m not sure what the official term is. Many clips have been copied and pasted in, or I might have paused to go for lunch and then returned to speak a bit louder or quieter.
I was hoping for a quick fix to highlight everything and set a uniform loudness—wouldn’t that be nice? Haha!
There is a Leveller effect, which (oddly) is under “distortion”. Effects → Distortion and Modulation → Distortion… Distortion type = Leveller.
Or there is an old free program called The Levelator which you can download from here.
Usually automatic level adjustment (or AGC/Automatic Gain Control) isn’t as good as human judgement but it might be OK for speech and if it’s subliminal you won’t hear it anyway.