That is why the world hates you!

(Arthur Pink)

"If the world hates you, keep in mind that it hated Me first. If you belonged to the world, it would love you as its own. As it is, you do not belong to the world, but I have chosen you out of the world. That is why the world hates you!" John 15:18-19

"Do not be surprised, my brothers, if the world hates you!" 1 John 3:13

The world will not hate mere professors.

The man . . .
  who is conformed to this world,
  who takes part in its politics,
  who shares its pleasures,
  who acts according to its principles-
even though he claims the name of Christ, will not be ostracized or persecuted.

The woman . . .
  who is conformed to this world,
  who follows its fashions,
  who enjoys its society,
  who desires its amusements,
 -will not be shunned by it.

The world loves its own. But those who walk in separation from the world (and they are few in number), those who follow a rejected Christ, will know something of what it means to enter into the fellowship of His sufferings (Philippians 3:10).

"Therefore come out from them and be separate, says the Lord. Touch no unclean thing, and I will receive you. I will be a Father to you, and you will be My sons and daughters, says the Lord Almighty." 2 Corinthians 6:17-18