At a glance
Born of Abraham's own effort to help God along — a child of natural energy, however sincerely intended.
Born only because God had promised it, when nature itself had nothing left to offer — a child of pure grace.
Relevant Scripture
“For it is written, that Abraham had two sons, the one by a bondmaid, the other by a freewoman. But he who was of the bondwoman was born after the flesh; but he of the freewoman was by promise.”
🎧 Listen to this chapter
Chapter 2 of the LibriVox recording of According to Promise, streamed directly from the Internet Archive (public domain, CC0).
UECF.NET summary
Spurgeon takes up Paul's use of Genesis in Galatians 4 as the key that unlocks the whole book: Abraham had two sons, and the difference between them was not effort, sincerity, or even fatherhood, but origin. Ishmael came from Abraham and Hagar in the ordinary way, the fruit of a plan hatched by unbelief when the promise seemed slow. Isaac came only when nature was, humanly speaking, exhausted, and God alone could act. Paul turns this ancient family story into a permanent picture of two ways religion can begin in any human life.
Applied to the soul, Ishmael represents everything that is produced by unaided human nature reaching toward God: self-reform, resolutions, sincere effort, and even real religious feeling, none of which required the Holy Spirit to regenerate the heart. Isaac represents the miracle of the new birth, a work as far beyond human capacity as an aged, barren couple bearing a son. Spurgeon's insistence throughout is blunt: no amount of trying will turn Ishmael into Isaac, because the two do not differ in degree but in kind.
The comfort in the chapter is that Isaac's birth depended entirely on God's word, not on Abraham and Sarah's remaining strength. In the same way, the new birth depends on God's promise and Spirit, not on how much natural capacity for religion a person feels they have left. Those who have given up on producing Isaac by their own effort are, in fact, in exactly the right place to receive him as a gift.
Main theological themes
- Genesis 21 read through Paul's own inspired commentary in Galatians 4
- The difference between religion that originates in unaided human effort and religion that originates in God's promise and Spirit
- New birth as a work only God can perform, never a self-improvement project
Key ideas
- Two sons of the same father can differ entirely in how they came to be, and that origin shapes everything after it.
- Sincerity and effort do not, by themselves, turn a natural work into a supernatural one.
- The delay of a promise is never permission to manufacture its fulfillment by human scheming.
- Coming to the end of one's own resources is often exactly where God's promise begins its work.
Important concepts
- Born after the flesh — Paul's phrase for anything in religion produced by unaided human nature, however respectable or sincere it may appear.
- Born through promise — New birth that depends entirely on God keeping His word and sending His Spirit, not on human effort or timing.
Related Bible references
Practical Christian application
- Notice any place where you have tried to produce spiritual fruit by sheer willpower rather than trusting God's promise.
- When a promise from God seems slow, resist the temptation to force an outcome your own way.
- Pray specifically that God would do in you what only He can do — not merely what you can arrange.
Questions for study
Reflection questions
- Where have you seen the difference between effort-driven religion and grace-given faith play out in real people you know?
- Is there an area where you, like Abraham with Hagar, have tried to help a promise along in the wrong way?
- What does it mean, practically, to “wait” on a promise without becoming passive or careless?
Small-group discussion
- Why do you think God allowed thirteen years to pass between Ishmael's birth and Isaac's?
- How can a church tell the difference between healthy discipleship effort and Ishmael-like self-effort?
- What comfort does it give a struggling believer to know that Isaac's birth depended on God's word, not Abraham's remaining strength?
These notes are an original UECF.NET study companion and are not a reproduction of Spurgeon's text. According to Promise (1900) is in the public domain — read the complete free text at the Internet Archive, or listen to the full LibriVox recording above and at archive.org. Scripture quotations above are the King James Version.