He calls us because he says we're ready.

Because he says we're ready to obey.

Look at Jeremiah. 

 ⁴ The word of the LORD came to me, saying,

 ⁵ "Before I formed you in the womb I knew ^[a] you,
       before you were born I set you apart;
       I appointed you as a prophet to the nations."

 ⁶ "Ah, Sovereign LORD," I said, "I do not know how to speak; I am only a child."

 ⁷ But the LORD said to me, "Do not say, 'I am only a child.' You must go to everyone I send you to and say whatever I command you. ⁸ Do not be afraid of them, for I am with you and will rescue you," declares the LORD.

 ⁹ Then the LORD reached out his hand and touched my mouth and said to me, "Now, I have put my words in your mouth."

Jeremiah 1:4-9 (NIV)

I didn't think I was ready to preach a sermon last year. God thought otherwise.

I didn't think I had time to lead a men's small group.  God thought otherwise.

I didn't think I could coach a girl's soccer team.  God thought otherwise (and now we're 8-1 with one game to play).

I didn't think my blog would garner much attention.  God thought otherwise and opened a door for me to write an article for a Christian website about small group ministry.

Are you ready to follow His call?

After all, we get another reminder in Jeremiah 10:23, as part of Jeremiah's prayer:

 ²³ I know, O LORD, that a man's life is not his own;
       it is not for man to direct his steps.