Helaman 13: 4

"And it came to pass that they would not suffer that he should enter into the city; therefore he went and got upon the wall thereof, and stretched forth his hand and cried with a loud voice, and prophesied unto the people whatsoever things the Lord put into his heart."

Samuel, a Lamanite, was commanded of the Lord to preach unto the Nephites. He tried to get into their city to preach, but they wouldn't let him in.  He gave a good effort, and I feel like some would have given up at that point. Not Samuel. He climbed upon the city walls and shouted his prophesies to the people. He did not give up! He knew that the Lord trusted him to preach, and so he did. I admire how he persevered and did what the Lord wanted him to do.