From Augustine's Confessions, Book XI "Time and Eternity", 31.41:
O how exalted are you, and yet the humble of heart are your dwelling place! You "lift up them that are cast down," and they do not fall down, whose place aloft is you!
From Dave Browning, Deliberate Simplicity, citing Mother Teresa:
You can do what I cannot do. I can do what you cannot do. Together we can do great things.
From Lamentations 3 (in the Bible), a prayer and lament that indicts God as the bringer of pain . . . just the sort of prayer we have trouble giving voice to, think is off-limits . . . but it is "in the book". Despite the direct and accusatory language, the prayer still turns back to trust. Prayer is an amazing road -- once we start down it we quickly find ourselves in the presence of God.
I am one who has seen affliction
under the rod of God's wrath;
he has driven and brought me
into darkness without any light;
against me alone he turns his hand,
again and again, all day long.
. . .
But this I call to mind,
and therefore I have hope:
The steadfast love of the LORD never ceases,
his mercies never come to an end;
they are new every morning;
great is your faithfulness.