“And base things of the world, and things which are despised, hath God chosen, yea, and things which are not, to bring to nought things that are:”
1 Corinthians 1:28

Your words are real and potent, and simply because they’re invisible doesn’t mean they aren’t effecting changes. Naturally, you give instructions via words and those instructions, when implemented cause changes, just like this Centurion explained succinctly:
“For I also am a man set under authority, having under me soldiers, and I say unto one, Go, and he goeth; and to another, Come, and he cometh; and to my servant, Do this, and he doeth it.” Luke 7:8
And just like he figured, if it happens like that naturally, then it can happen spiritually, after all the bible says:
“For the invisible things of him from the creation of the world are clearly seen, being understood by the things that are made, even his eternal power and Godhead…” Romans 1:20
So with words, you can give instructions and demons and afflictions would disappear and you don’t even have to be in that location, just like the Centurion figured:
“Wherefore neither thought I myself worthy to come unto thee: but say in a word, and my servant shall be healed.” Luke 7:7
And he was right:
“And they that were sent, returning to the house, found the servant whole that had been sick.” Luke 7:10
Not just that, Jesus was so impressed, he marvelled! That the Centurion figured the potency of words spoken with authority was so impressive to Jesus:
“When Jesus heard these things, he marvelled at him, and turned him about, and said unto the people that followed him, I say unto you, I have not found so great faith, no, not in Israel.” Luke 7:9
You can bring to nought things that are, through the word of God, in the name of Jesus, even when you’re not in that location! That is really some good news!!