"But what comes out of the mouth proceeds from the heart, and this defiles a person."
There are all kinds of things we can do or not do and say or not say to be humble. But those things are useless on their own.
It is easy to fake humility. It's easy to act ourselves into thinking we're humble. It's even easy to get so good at acting humble that we are prideful about our "humility".
But actions don't create or determine humility.
The heart determines humility.
And hearts are hard to change. Hearts are tricky and selfish and deceitful.
...our hearts are wicked.
““The heart is deceitful above all things, And desperately wicked; Who can know it?”
So can our wicked hearts, our minds inclined to sin, and our lives tainted by evil, even be capable of humility?
Yes. For we serve a God who changes hearts. That is what He has done all along...
"I will give them a heart to know that I am the Lord, and they shall be my people and I will be their God, for they shall return to me with their whole heart.”
...and that is what He will continue to do in us.
So let's come to Him asking, seeking tender and humble hearts. He has promised to give to those who ask and to be found by those who seek.
And yes...it takes humility to even ask, to even believe that He is great enough to change our hearts.