We are to live by faith & not by sight since it's faith that pleases God.
Let's remember that only God can change the heart of someone we love & care about. It's our responsibility to get them in touch with Jesus...bring them to the cross by our prayers, actions, words & deeds....then pray that God will change their heart.
We can totally trust Him because He is faithful! It is His very essence! He hears & answers the cries of our heart, so He WILL bring to pass His perfect plan & will for their lives!