“God won’t give you more than you can handle” isn’t in the Bible, but people quote it all the time. It does say “He will not allow you to be tempted beyond your ability” (1 Corinthians 10:13 emphasis added), but that is in reference to sin, not overwhelming circumstances. I once met a single mom who told that she worked 3 jobs and was getting ready to go back to school, “but I know God won’t give me more than I can handle.” I haven’t seen her since. She had put more on herself than she could handle, and she’s probably very confused right now.
God gives people more than they can handle all the time. He told an ex-convict to approach the most powerful man in the world and demand that he release his largest labor force (Exodus 2:11-12, Exodus 3:7-10). He told a total wimp to lead an army (Judges 6:11-16). He had a kid beat a national champion soldier with a pebble (1 Samuel 17:4-50). He spread the news of Jesus, that changed the world, with a group of rednecks, a terrorist and a government sell-out (Luke 6:13-16, Acts 4:33). Finally, He asks ordinary people to live a life of radical self-denial (Matthew 16:24) in order to get a treasure that you can’t see (Luke 12:33). He specializes in giving us more than we can handle. That way, when what He has called us to works, we can’t help but say how great He is and how weak we are (1 Corinthians 1:26-31).
Imagine a life where God never puts more on you than you can handle. You could never hope to live a truly significant life. You could never dream huge dreams. You could never see God work through you in incredible ways that you could never do on your own. You could never be a part of God’s redemption story, where He takes a fallen and broken world, and restores it through weak and sinful people. Thank God, He constantly puts on us more than we can handle.