In ancient times, a strong tower was a place of refuge during an attack. They were high, fortified, and unshakable. When danger came, people ran toward it, not away. In the same way, God invites us to run to Him. When life feels uncertain, we can call on His name and rest in His unchanging nature.
Proverbs 18:10 (ESV)
10 The name of the LORD is a strong tower: the righteous man runs into it and is safe.