Mat 10:19 But when they deliver you up, take no thought how or what you should speak: for it will be given you in that same hour what you shall speak.
Mat 10:20 For it is not you that speak, but the Spirit of your Father which speaks in you.

"Take no thought" is the negative of merimnao, which means "to be anxious" and "to care for" like we use the term "don't worry." "Speak" is laleo, which is not a formal speech but just talking, even "to chatter" or "prattle."

"Spirit" is pneuma, which literally means "wind" and "breath." It also has the meaning of "breath of life" and "divine inspiration."

Christ here is almost playing down the quality of what you might say under dire situations by using the term laleo. The point is that we shouldn't worry about the words. The chatter is a gift is a gift from God. I guess that includes this chatter as well.