John Trapp on Isaiah 51:2

Ver. 2. Look unto Abraham your Father] Look and again Look: hearken and again hearken: Theſe poor Jews, before the coming of Chriſt in the fleſh, were vino ſomnoque ſepulti, drunk with the cup of Gods fury, ver. 17. and ſo faſt aſleep, that they needed to be thus rouſed and raiſed up to the hope of better times, which now were at hand.

And unto Sarah that bare you] By the force of her Faith alſo, Heb. 11.11. her ſon Iſaac was emeritae fidei filius. Now theſe domeſtical examples are alledged, to aſſure them that God could do the like again in reſpect of ſpiritual children, Abraham's right ſeed, Gal. 4.

For I called him alone] Be not ye therefore troubled at your aloneneſſe.

And bleſſed him, and increaſed him] Gods benediction is his benefaction; the Popes is not ſo: fumos vendit, fumo pereas.