From the end of the earth will I cry unto thee, when my heart is overwhelmed: lead me to the rock that is higher than I.
From the end of the earth - remote from the place where, in Jerusalem, God manifests his presence. David being an exile from the Lord's land, felt himself as it were banished to "the end of the earth."
When my heart is overwhelmed (Psalms 102:1-28, title; Psalms 107:5; Psalms 77:3) - literally, 'is covered,' namely, with faintness and gloom.
Lead me to the Rook that is higher than I - too high for me to ascend by my natural powers.