Waiting on God can be worse than the doctor's office.
4 So Abram had sexual relations with Hagar, and she became pregnant. But when Hagar knew she was pregnant, she began to treat her mistress, Sarai, with contempt. 5 Then Sarai said to Abram, “This is all your fault! I put my servant into your arms, but now that she’s pregnant she treats me with contempt. The Lord will show who’s wrong—you or me!”
6 Abram replied, “Look, she is your servant, so deal with her as you see fit.” Then Sarai treated Hagar so harshly that she finally ran away.
So God has made a promise to you that he didn't come through on yet, why not give him a hand? If you can find a way to make it happen and he already said that it would happen, then whats the problem?
Abram fell for the "easy" solution to the problem instead of waiting for God to provide the break through that was needed to give him a heir to inherit God's promise. Stepping out of God's will to get things done for God is a trait that Abram had a problem dealing with.
Staying in God's will can be hard to do, especially when bending the rules a little bit can seem to be so beneficial. That's when real faith has to kick in, when you are so close to God's promise and yet you're not there yet, we have to resist the urge to jump ahead and give him some help.
I have to be careful to stay on God's schedule, the human desire is instant reward and one minute solutions to life's problems. I have to remember that he has my best interest in mind and that he has a big picture point of view that I can not see from where I am.
Help me to trust you enough Lord to rely on your provision and your timing.