The design of the ark is thoughtful and complete. One door — only one way in. This detail later becomes a powerful image of God's salvation: there is a door, and God controls it.
Memory phrase: One door — God's way in.
Talk about it: If there was only one door on the ark, what does that tell you about how important it is to get inside?
Prayer: God, You are the door to safety and life. Help me always come to You.