A hard thing, i. e. a rare and singular blessing, which I cannot promise thee, which only God can give; and he gives it only when and to whom he pleaseth. If not, it shall not be so: this sign he proposed not without the instinct and direction of God's Spirit, that hereby he might engage him more earnestly to wait, and more fervently to pray, for this mercy.
Related Commentaries of 2 Kings 2:10
2 Kings 2:10
10 And he said, Thou hast asked a hard thing: nevertheless, if thou see me when I am taken from thee, it shall be so unto thee; but if not, it shall not be so.