Charles Spurgeon Commentary John 17:17-18

"Sanctify them in the truth: thy word is truth. As thou didst send me into the world, even so sent I them into the world." — John 17:17-18 (ASV)

Sanctify them through your truth: your word is truth. As you have sent me into the world, even so have I also sent them into the world.

Christ was the great Missionary, the Messiah, the Sent One; we are the minor missionaries, Sent out into the world to accomplish the Father's will and purpose.