Do you not know? Have you not heard? The Lord enthroned on high,
He is the everlasting God who made both earth and sky.

He will not weary or grow faint. His power is measureless.
His wisdom is unsearchable, and great His faithfulness.

The weak and weary He revives when unto Him they cry.  And those who have no might He will with growing strength supply.

Though youths grow weary and may fall, though young men strive in vain.

The Lord helps those who wait for Him; their strength they shall regain.

They shall mount up with eagles' wings, unwearied they shall run.
They'll neither falter nor grow faint as they in faith walk on.

Isaiah 40, Orlando Gibbons