Michelangelo's David is based on the artistic discipline of disegno. It is said that under this discipline, sculpture is considered to be the finest form of art because of how it mimics divine creation. Michelangelo worked under the premise that the image of David was already in the block of marble he was working on, in much the same way that the human soul is thought to be found within the physical body (Michelangelo's David).
The splendor of the discipline of disegno. David was already in that untapped block of marble Michelangelo worked with. All that Michelangelo had to do was to find him. It's poetic and emotionally stimulating.
Michelangelo had studied anatomy early in his life. He worked on corpses to learn how the body worked. This was important in the creation of David because of the intricate details in David's muscles and overall body appearance. The dedication to his creation is admirable. To study cadavers to perfect your craft to me is beautiful. Though David isn't perfectly anatomically correct (The upper part of his body is larger in scale than his lower) it was believe that this statue was intended to be place on a high pedestal in a church. So when one looks up, the body will seem perfectly proportional.
David is also an example of the classical humanism