I didn't know Doug well at all. But I do know that he had an abiding sense of the presence of Christ. He knew that thousand of people groups around the world did not know Christ, and he wanted to take Christ to them. He was content in God, and discontent with others not knowing God.
In 1801 William Cowper's posthumous collection, Poems Translated from the French of Madame de la Mothe Guion [Madame Guyon] was published. One of the selections, "My Lord, How Full of Sweet Content," was originally written in 1722. It was eventually turned into a hymn and set to the music of Lowell Mason's "Hamburg" (1824). I think it helpfully summarizes Doug's heart, and the perspective all of us should have on the presence of God, freeing us to be happy in God whether we go or stay:
My Lord, how full of sweet content;
I pass my years of banishment!
Where’er I dwell, I dwell with Thee,
In heaven, in earth, or on the sea.
To me remains nor place nor time;
My country is in every clime;
I can be calm and free from care
On any shore, since God is there.
While place we seek, or place we shun
The soul finds happiness in none;
But with a God to guide our way,
’Tis equal joy, to go or stay.
Could I be cast where Thou are not,
That were indeed a dreadful lot:
But regions none remote I call,
Secure of finding God in all.