Isaiah was a prophet. John the Immerser was a prophet. Isaiah foretold John's coming, his character, and his work. John came to "prepare the way" for Christ to introduce the people to Christ and to turn their hearts to Him. Arresting references to John and his character are sprinkled throughout the Gospel records. The picture shows John as a prophet who:

Saw clearly his mission and accepted it.
Had an earnestness that attracted large crowds.
Was fearless in condemning sin from the lowest to Herod.
Had a humble heart.
Embraced an austere life-style.
Exerted tremendous moral influence.
Didn't need miracles (John 10:41).
Resisted an empty popularity.

Our own American poet Longfellow wrote:

Lives of great men all remind us
We can make our lives sublime,
And, departing, leave behind us
Footprints on the sands of time.