The author of the following story is unknown to me:

A mother wishing to encourage her young son's progress at the piano brought him to a concert given by the famous Polish pianist, Paderewski.  When the evening arrived, they found their seats near the front of the concert hall and eyed the majestic Steinway waiting on stage.  Soon the mother found a friend to talk to, and the boy slipped away.

At eight o'clock, the lights in the auditorium began to dim, the spotlights came on, and only then did they notice the boy upon the bench, innocently picking out "Twinkle, Twinkle Little Star".

His mother gasped, but before she could retrieve her son, the master appeared on the stage and quickly moved to the keyboard. He whispered to the boy, "Don't quit. Keep playing."

Leaning over, Paderewski reached down with his left hand and began
filling in the bass part. Soon his right arm reached around the other side and improvised a delightful obbligato. Together, the old master and the young novice held the crowd mesmerized.

In our lives, unpolished though we may be, it is the Master who surrounds us and whispers in our ear time and time again, "Don't quit.  Keep playing." And as we do, He augments and supplements, until a work of amazing beauty is created.

"Therefore we also pray always for you that our God would count you worthy of this calling, and fulfill all
the good pleasure of His goodness and the work of faith with power, that the name of our Lord Jesus Christ may be glorified in you, and you in Him, according to the
grace of our God and the Lord Jesus Christ."
(2 Thessalonians 1:11-12)