Take no thought - That is, be not anxious or unduly solicitous. See the notes at Matthew 6:25. This was a full promise that they should be inspired, and was a most seasonable consolation. Poor, and ignorant, and obscure fishermen would naturally be solicitous what they should say before the great men of the earth. Eastern people regarded kings as raised far above common mortals - as approaching to divinity. How consoling, then, the assurance that God would aid them and speak within them!
Related Commentaries of Matthew 10:19
Matthew 10:19-20
19 But when they deliver you up, take no thought how or what ye shall speak: for it shall be given you in that same hour what ye shall speak.
20 For it is not ye that speak, but the Spirit of your Father which speaketh in you.