Correct, people only transfer their understanding to others and so a spirit is nothing more than an understanding- but when the spirit of truth (God) comes, there's only one thing and that is understanding the truth. You can move and hiss and perform all kinds of display, they have nothing to do with the truth. This is what God requires:
Jer 31:
33“But this is the covenant I will make with the house of Israel
after those days, declares the LORD.
I will put My law in their minds
and inscribe it on their hearts.
And I will be their God,
and they will be My people.
34No longer will each man teach his neighbor or his brother,
saying, ‘Know the LORD,’
because they will all know Me,
from the least of them to the greatest, declares the LORD.
For I will forgive their iniquities
and will remember their sins no more.”
Jer 24:
6I will keep My eyes upon their good and will return them to this land. I will build them up and not tear them down; I will plant them and not uproot them.
7I will give them a heart to know Me, that I am the LORD. They will be My people, and I will be their God, for they will return to Me with all their heart.
The word used as the heart means the mind and the only process that goes on in the mind is understanding. So God works in His people's mind so that they know Him by understanding Him.
You can move on the floor and cry and laugh all night but it will have no impact in understanding. Modern day tongues are the opposite, they take away they understanding.
Jesus said His words are spirit, the words of Jesus should not make anyone move and laugh but we need to understand only.