In Breaking Busy, Alli Worthington tells a story about her childhood jar of marbles. Some were dusty and muddy colored, some were vibrant and glistening. When she removed the dingy ones, the whole effect became more beautiful.
She wraps this story up in a beautiful metaphor. Our shiny marbles represent our unique talents, gifts, and passions. The dirty marbles are the lame expectations and distractions muddying our brilliance.