RD3LoR

You enter the next room. You are standing on a stone platform, there is another stone platform about 50 feet away. In between the two platforms is a pillar with writing inscribed onto it. And instead of a floor, there is a sea of...
Quicksand!
You have no idea how to cross the quicksand, but know that there must be a clue on the writing on the pillar. Just as you are about to give up, the Voice appears, and says "Sinking, and drowning are not the same thing, but if you assume so the devil will sing." You have no idea what this means, but look around for clues. you see a picture on the left wall, but nothing on the right wall. You go examine the picture to see...
A map. It has somthing that looks like the side view of a door on a platform on the side closest to you, and another one on the side farthest from you. In between the two is a large pillar that reaches from the top to the bottom of the wall. In between the two platforms is a sea of dots, at the bottom of the wall, at the base of the pillar, is a door:
 ppppppp 
 ddd ppppppp ddd
 ddd ppppppp ddd
 ddd ppppppp<--pillar ddd
 ddd ppppppp ddd
 ddd ppppppp ddd
 pppppppppppppp......................................................ppppppp....................................................pppppppppppppp
 pppppppppppppp......................................................ppppppp....................................................pppppppppppppp
 ........^...........................................................ppppppp...........................................................^......
 ........|...........................................................ppppppp...........................................................|......
 .....platform.......................................................ppppppp.......................................................platform... ppppppp
 ppppppp
 ppppppp
 ppppppp
 ppppppp
 ppppppp
 ppppppp
 dppppppp
 dppppppp
 dppppppp
 dppppppp
 dppppppp
 dppppppp
 fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff
 d=door
 f=floor
 .=quicksand
looking at the map, you realise that the answer to the riddle lies below the quicksand. You jump in, and slowly sink down to the bottom