Was Hudson Taylor’s Spiritual Secret the Same as Paul’s?

I see it in the ESV (and NASB, NIV): “I know how to be brought low, and I know how to abound. In any and every circumstance, I have learned the secret of facing plenty and hunger, abundance and need”

But I don’t see it in the Greek text.

NKJV: “I know how to be abased, and I know how to abound. Everywhere and in all things I have learned both to be full and to be hungry, both to abound and to suffer need.”

It’s the Greek verb μυέω