Consider Gideon. In Judges 6, you find Gideon hiding in the winepress beating the wheat to hide from the Midianites. The Angel of the Lord meets him there and says, "The Lord is with you, you mighty man of fearless courage!" What?? He's hiding in the winepress!! That doesn't look too courageous to me. But God knew who Gideon was created to be....and He was calling it forth. Look at the Samaritan woman at the well. The fact she came at noon speaks volumes--most women went early in the morning before it got hot. She was avoiding meeting people because of her situation. But Jesus sat and talked with her--which was unheard of for a Jewish man to talk to a Samaritan woman (lower than low in that day and culture). Jesus didn't avoid her sin. He addressed it (the fact he knew the details of her life got her attention!)...and called forth a true worshiper. She left excited and ran to share her news with everyone--so they could come and hear Jesus, too. She left...changed.
See those things in your children and speak of them. If the Spirit of God shows you some great things to expect in their lives, tell them. They will aspire to it. I remember spending time praying for each of my children when they were in middle school/high school and seeing things to expect in their lives which also existed in the lives of certain Bible characters. I called it out. I wrote it, read it to them, and prayed it over them. And now I'm seeing those things developing in their lives. It's powerful. Ask God how you can come in agreement with Him for those you love. Each person has greatness God has planted there and you can be a tool to cultivate it.