Exodus 31:17 It is a sign between Me and the children of Israel forever; for in six days the Lord made the heavens and the earth, and on the seventh day He rested and was refreshed.
God is great at setting up things which remind us of other things; our minds are fickle and go off on tangents whenever they can (or so it seems.)
God wants us to not just remember Him when the going gets tough but to remember Him always. To do that we need to keep Him in our minds and hearts.
You will find it easier to remember things if you have reminders – allow God to show you what to do to remember His Word and His ways throughout all of your life.