External communication is what you say to others. Internal communication is what you say to yourself.
Others may not talk the good report to you, so talk it to yourself. What you say about your enemy, your future and your expectations affects what you believe.
“This book of the law shall not depart out of thy mouth; but thou shall meditate therein day and night, that thou mayest observe to do according to all that is written therein: for then thou shalt make thy way prosperous, and then thou shalt have good success.”
(Joshua 1:8)