What is the music playing in episode 14, when Gowther was talking about the cycles in the cave? I'm looking for a piece of music in Seven Deadly Sins that plays at 5:15 of episode 14, when Gowther explains about the life cycle to the armor beast.
The track is called PT-16: Taizai and is from The Seven Deadly Sins Original Soundtrack 2. 

It is composed by Hiroyuki Sawano.

The track can be found here: https://www.youtube.com/watch?v=R_D-Ob908LU

Note that the part that appears in episode 14 starts at around 1:06 on that track.