Again, Jesse made seven of his sons to pass before Samuel. And Samuel said unto Jesse, The LORD hath not chosen these.1 Samuel 16:10 Parallel Commentaries

Early Days
The life of David is naturally divided into epochs, of which we may avail ourselves for the more ready arrangement of our material. These are--his early years up to his escape from the court of Saul, his exile, the prosperous beginning of his reign, his sin and penitence, his flight before Absalom's rebellion, and the darkened end. We have but faint incidental traces of his life up to his anointing by Samuel, with which the narrative in the historical books opens. But perhaps the fact that the story …
Alexander Maclaren—The Life of David

And He had Also this Favour Granted Him. ...
66. And he had also this favour granted him. For as he was sitting alone on the mountain, if ever he was in perplexity in his meditations, this was revealed to him by Providence in prayer. And the happy man, as it is written, was taught of God [1112] . After this, when he once had a discussion with certain men who had come to him concerning the state of the soul and of what nature its place will be after this life, the following night one from above called him, saying, Antony, rise, go out and look.' …
Athanasius—Select Works and Letters or Athanasius