Charles Swindoll used this statement in his book The Tale of the Tardy Oxcart – If miracles happened every day they would be called REGULARS. I think it is fair to say that Abraham had miracles, signs, and wonders working in his life. Look at his narrative from Genesis 12 to 25 and realize that it covers 100 years of life you start to understand they were not “regulars.”
The other side of this topic is John 14: 12 where doing “greater miracles” is promised. The “greater” carries the idea of more not better. I have always thought that the person doing these “more” miracles are doing them for other people and not for themselves. In Acts, the Apostles did a lot of miracles “among the people”.
Acts 2:22 says Jesus was accredited by doing miracles, signs, and wonders and Paul says that these also marked his apostolic ministry. So miracles being done for God’s people are part of our heritage. Of all the times wonders and signs are mentioned in the New Testament most are in a positive light. Three times they refer to counterfeits or false prophets doing them: Mark 13:22, Matthew 24: 24, and 2 Thessalonians 2: 9. The Spirit of God will show you the difference and keep you from being deceived. The key is who is being given the glory!
It does seem possible that you can see miracles, signs, and wonders done by God for His glory and still not understand. The children of Israel did this as they left Egypt and treated those signs and wonders lightly.
Other posts on the miraculous: The Seven Miracles in John, Miracles, and Storms, The Problem With the Miraculous.