Why art thou cast down, O my soul? and why art thou disquieted in me? hope thou in God: for I shall yet praise him for the help of his countenance.
The psalmist interrogates his own soul — 'Why art thou cast down?' — and answers with an instruction: 'hope thou in God.' The refrain repeats three times across Psalms 42 and 43, because once was never going to be enough.