The creation of a masterpiece is usually not the result of some brief, haphazard effort. The Mona Lisa required four years for Da Vinci to complete. In fact, x-rays have shown that there are three previous versions of the painting under the one we are familiar with. Michelangelo took four years to paint the scenes on the ceiling of the Sistine Chapel. Rodin made his first plaster cast of The Thinker in 1880, but it wasn’t until 1902 that he completed the large-scale bronze cast.
God is creating you into a masterpiece in your soul realm. Like many of the great works of art we see, we don’t become a finished work of art all at once. Paul writes that we were created (past tense), but we are (present tense) God’s masterpiece.