Ezra was a skilled scribe.  His task, at least in part, was much like that of a preacher. How did he get that way? What was the source of such skill?
Here is the answer:

Ezra had determined in his heart to

• Study the law of the Lord,
• Obey it,
• And teach its statutes and ordinances.      (Ezra 7: 10)

Therefore, “the gracious hand of God was on him.”

The combination of the three factors listed above was the source of his skill—and still, today, remains the same. Omit any one of them and a preacher will fail.