"Hem your blessings with thankfulness so they don't unravel."
This is a good picture of why it's good to have a strong foundation. A hem keeps each thread in place otherwise a shirt would start to fall apart and be a useless pile of fabric. Having a solid foundation is key to living a life as a Christian. Matthew 7:24-25 Jesus speaks about having a foundation based on solid rock instead of one built on sand. If you have a weak foundation then everything else you put on top or find value in will not hold up when the storms of life come. There will not be strength to stand and the result will always be dismal.
If you have your foundation set on The Rock then everything you build above it will be solid. We worry, stress and cope in harmful ways = foundation built on sand. When something bad happens and we focus on Jesus and set our life up in a way that will glorify Him no matter what = foundation built on rock. This foundation will be tested in times of sorrow, trouble, anger, jealously, etc. Only then will we see what we put our faith in.