Where Did Sin Originate?

Isaiah 14:12-15 (NKJV)
  "How you are fallen from heaven, O Lucifer, son of the morning! How you are cut down to the ground, You who weakened the nations! For you have said in your heart: 'I will ascend into heaven, I will exalt my throne above the stars of God; I will also sit on the mount of the congregation On the farthest sides of the north; I will ascend above the heights of the clouds, I will be like the Most High.'   Yet you shall be brought down to Sheol, To the lowest depths of the Pit.
 Sin originated with Lucifer, Satan, the devil, or adversary but it entered through Adam. How did sin get into the world? -Through Adam and it is still here making its mark on everyone.