'Flesh' in the Bible

I searched in my heart how to cheer my flesh with wine, my heart yet guiding me with wisdom, and how to lay hold on folly, till I might see what it was good for the sons of men that they should do under heaven all the days of their life.

The fool foldeth his hands together, and eateth his own flesh.

Suffer not thy mouth to cause thy flesh to sin; neither say thou before the angel, that is was an error: wherefore should God be angry at thy voice, and destroy the work of thy hands?

Therefore remove sorrow from thy heart, and put away evil from thy flesh; for youth and the dawn of life are vanity.

And furthermore, my son, be admonished: of making many books there is no end; and much study is a weariness of the flesh.