But what should you do if you are not aware of this need and have no hunger and thirst for the Sacrament?
To such a person no better advice can be given than this:
first, he should touch his body to see if he still has flesh and blood. Then he should believe what the Scriptures say of it in Galatians 5 and Romans 7.
Second, he should look around to see whether he is still in the world, and remember that there will be no lack of sin and trouble, as the Scriptures say in John 15-16 and in 1 John 2 and 5.
Third, he will certainly have the devil also around him, who with his lying and murdering day and night will let him have no peace, within or without, as the Scriptures picture him in John 8 and 16; 1 Peter 5; Ephesians 6; and 2 Timothy 2."
Luther’s Small Catechism (Christian Questions with Their Answers, #20)
Way too good not to share.