'Fragile' in the Bible

His source of confidence is fragile;what he trusts in is a spider’s web.

The house he builds is as fragile as a moth's cocoon, like a hut that a watchman has made.

“And all the inhabitants of Egypt will know [without any doubt] that I am the Lord,Because they have been [only] a staff made of [fragile] reeds to the house of Israel.

And as the toes of the feet were part of iron and part of clay, the kingdom shall be partly strong and partly fragile.

But we have this treasure in a fragile vase of clay, in order that the surpassing greatness of the power may be seen to belong to God, and not to originate in us.