In his Experiencing God devotional book Henry Blackaby writes pointedly:

"There are times when Jesus will ask you to join Him as He is at work in the life of your friend, family, or coworker. If you are preoccupied with your own needs, you will miss the blessing of sharing in His divine activity. God is gracious. He forgives, and He provides other opportunities. He will even use our failings to bring about good, but it is critical that we respond in obedience to every prompting from God. God does not need our obedience; He has legions of angels prepared to do His bidding when we fail Him. The loss is ours as we miss what God wants to do in our lives."
At this moment, I am sitting at the computer early in the morning ("o'dark hundred") having just rolled out of bed and stumbled downstairs a few minutes ago. Outside, about 100 yards in front of my house, a company of Marines is making a heap of noise. They are outfitted in full gear and the Gunny is screaming every obscenity he can conjure. These guys are running some kind of tortuous drills. But, boy, are they motivated. Lots of "ooh-rahs" and cheering fill the air. The sun is just comng up.
Farther away, an artillery battery has started firing the big guns. A dull thud and "Boom" reverberates through the house every 20 minutes or so.
The birds are still singing. Like us, they are used to the noise. Living on base, I daily see countless young Marines going about the business of soldiering. They are being conformed to one another, conformed to being a Marine. It is serious stuff.
I don't mind these drills out in front of my house. I am sorry that my kids might wake up and hear an obscenity. But I know that those guys are training for battle one day. And I am reminded that many (most?) of them do not know Christ. They are well-prepared to win a physical battle, but spiritually they are helpless without Him. This is my prayer-field.
I wish I could say that I take every opportunity God offers to me. But I don't.
Like Blackaby says, I get caught up in my own needs.
But sometimes I will pass a young man in uniform (and amazingly they seem to get younger and younger!) and I will be struck with the possibility that he may be deployed tomorrow. He may be in combat next week. He may be in a car accident overnight. Those thoughts motivate me to pray for him, to pray that the Lord will put a Godly friend or Chaplain in his path, that his heart will be softened to the truth and he will come to know Christ as his Saviour, his Friend, his Front and Rear Guard...
And then there are the families...
I don't want to miss what God is doing around me. I am praying about this neighborhood He put us in. It is really beautiful. Technically, it is a miracle that we got this house. But He is completely in control. So Mark and I are anticipating what He is already doing here. We want to join Him. So I am praying. And I am making friends. And I am looking to see where God is at work.
Oh, I wonder how often the angels have had to pick up my unfinished tasks. Or when they have gotten the privilege of doing His bidding when I failed...I look back and I know that I have often been too preoccupied with my self and my family to share in His activity. But I just have to wrap myself in His grace, take another breath, look out my window...and try again.
Thank You, Lord.