For myself, to start off the week, Isa 40:28-31 was a good reminder. Embodied in the form of the song 'Everlasting God' which we sang today, the lyrics speak for themselves.
Strength will rise as we wait upon the Lord....
The chorus is particularly uplifting:
You are the everlasting God
The everlasting God
You do not faint
You won't grow weary
You're the defender of the weak
You comfort those in need
You lift us up on wings like eagles.
Its a much-used passage, but it rings true time and again. Something to hold on to on busy nights on call, or while waking up to the prospect of another day at work.