Moments of weakness are bound to hit us.
Moments of feeling as though we're unable to continue, that we cannot endure, that we have reached our limit- these happen in our lifetimes.
The faltering moments may be understood as a test from one perspective, and from another, perhaps we feel weak because we're genuinely tired and need genuine rest.
Genuine rest. Now there's a topic for an entry! When was the last time many of us felt genuinely rested and refreshed?
So perhaps what see as weakness is, in fact, the need for genuine rest.
If one works out the muscles but doesn't get sufficient rest, this may only damage the muscles and not make them stronger. So, too, perhaps if our soul is exhausted and never given refreshment, we only experience damage and weakness.
Remember to be gentle with yourself...and also know that sometimes, you can continue pushing forward simply because you are being gentle with yourself.
Many people are far stronger than they realize; they need only for that strength to be unlocked.
Meditation is the key. This point can't be emphasized enough.
I hope that you find the rest and the strength that you need.