What does Mr. Frank want Miep to do with his papers?

Mr. Frank tells Miep to burn all of his papers?

Miep (hurrying up to a cupboard). Mr. Frank, did you see? There are some of your papers here. (She brings a bundle of papers to him.) We found them in a heap of rubbish on the floor after . . . after you left. !

Mr. Frank. Burn them. (He opens his rucksack to put the glove in it.) !

Miep. But, Mr. Frank, there are letters, notes . . . !

Mr. Frank. Burn them. All of them.