[The] glorious might of God that we need to see and trust is the power of God to turn all our detours and obstacles into glorious outcomes.
If we believed that our hold-up at the long red light was God’s keeping us back from an accident about to happen, we would be patient and happy. If we believed that our broken leg was God’s way of revealing early cancer in the x-ray so that we would survive, we would not murmur at the inconvenience. If we believed that the middle-of-the-night phone call was God’s way of waking us to smell smoke in the basement, we would not grumble at the loss of sleep. The key to patience is faith in the future grace of God’s “glorious might” to transform all our interruptions into rewards.
In other words, the strength of patience hangs on our capacity to believe that God is up to something good for us in all our delays and detours. This requires great faith in future grace, because the evidence is seldom evident.
– John Piper, Future Grace