In the scripture, David faced all kinds of opposition. People speaking defeat over him, thought saying he would never reach his destiny. How did he keep his mind filled with faith? He said in Psalm 38:12-13
My enemies lay traps for me, they make plans to ruin me. But I am deaf to their threats. I choose to hear nothing at all.
If you're going to reach your potential, you have to become deaf to the negative. When threats come that is discouraging thoughts, people speaking defeat, you have to do like David and choose to hear nothing at all. Don't give it the time of day. Let it go in one ear and out the other.