Rest when you need it. Anything else is non-sensical. Some of the biggest and strongest people I know lift when the body tells them it is ready.
One of the most popular programs, 5/3/1 actually integrates a rest/deload week into it to allow for proper healing and growth.
Mt Snow, VT - May 5, 2012 - Completed!
Gunstock, NH - June 1, 2013 - Completed!
...i remain, he who remains to be...