Here are some good posts on missions to ponder:

You Can’t Avoid the Missionary Implications of Our Faith – John Stott via Trevin Wax

How Much Is Left to Do in the Great Commission? – John Piper (Desiring God)

Answering 7 Common Objections to Long-Term Missions – Ben Stevens (Gospel Coalition)

Why Less Is More in Missions – Matt Smethurst (Gospel Coalition)