Human Means for Divine Ends

When Abram and Sarai grow old, they begin to think it’s time to take measures into their own hands. This move was culturally appropriate, but God had different plans for achieving his purposes. In the midst of this, God reveals Himself as “The God who sees” to the servant Hagar. What does it mean to wait on the Lord to accomplish His purposes as opposed to living out “God helps those who help themselves”?