Go, and I will be with your mouth and teach you what you shall say.
When God called Moses to serve, he replied, “O my Lord, I am not eloquent, neither before nor since You have spoken to Your servant; but I am slow of speech and slow of tongue” (Exodus 4:10).
The language suggests that Moses may have had a speech impediment. Perhaps he stuttered. The Lord said to him, “Who has made man’s mouth? Or who makes the mute, the deaf, the seeing, or the blind? Have not I, the Lord?” (v.11).
Our impairments, our disabilities, our handicaps are used by God for His own glory. His way of dealing with them may not be to remove them but to endow us with strength and use our limitations for good.
If our weaknesses cause us to seek God and rely on Him, they actually help us instead of hinder us. In fact, they become the best thing that could happen to us, because our growth in courage, power, and happiness depends on our relationship with the Lord and how much we are relying on Him.
Three times the apostle Paul pleaded with the Lord to remove his impediment, but the Lord answered, “My grace is sufficient” (2 Corinthians 12:9).
Paul then gloried in his limitations, for he realized that they did not limit him. As he put it, “When I am weak, then I am strong” (v.10). (David Roper, ODB.org)
God's strength is best seen in our weakness.