"The sheep hear His voice" (John 10:3). Amid so many other sounds and scares, Christians hear the voice of Christ, their Shepherd. His voice and words speak faith into our anxious hearts. And because He is risen, we will never be without His voice.
Much is made of the "I am" statements of Jesus. "I am the good shepherd" (John 10:11). But you too have an "I am" statement:
I am Jesus' little lamb,
Ever glad at heart I am;
For my Shepherd gently guides me,
Knows my need and well provides me,
Loves me ev'ry day the same,
Even calls me by my name.
A heart that is always glad. Such is the main symptom of sheep faith.