The need to validate ourselves through achievement is a trap. One of the biggest obstacles to wellness via quiet time, in fact, is an identity rooted in achievement. But the beast is never satisfied.
When our identity is defined by what we achieve, rather than who we are, the mere thought of not achieving for a period of time makes us anxious. As we press on through anxious feelings in quiet time, we signal to our brain that our mental health is our greatest priority.