The devil's apple has a bitter core!

(Thomas Watson)

Sin puts . . .
  a worm into conscience,
  a sting into death,
  and a fire into Hell!
Did men meditate of this, that after all their dainty dishes, death will bring in the reckoning in Hell, they would say as David in another sense, "Let me not eat of their dainties!" Psalm 141:4

The devil's apple has a bitter core!

"That none of you may be hardened by sin's deceitfulness!" Hebrews 3:13