John Trapp on Psalms 21:4

Verſ. 4. He asked life of thee] Quando fugiebat à Saule, ſaith R. Solomon, when he fled from Saul; rather when he went into the field againſt his enemies, carrying his life in his hand. His life we begged, Pſal. 20.1, 2. and thou haſt not only given him his life, but a long continued ſeries of lives in his Succeſſors, 2 Sam. 7.13. Pſal. 72.15. yea life everlaſting in Chriſt his Son, according to the fleſh. See Pſal. 61.6. Thus God is better to his people than their prayers; and when they ask but one Bleſſing, he anſwereth them as Naaman did Gehezi, with Nay take two. Hezekiah asked but one life, and God gave him fifteen years, which we reckon at two lives, and more. He giveth liberally, and like himſelf; as Great Alexander did when he gave the poor Begger a City; and when hee ſent his School-maſter a ſhip full of Frankincenſe, and bade him ſacrifice freely.