These two phrases are very similar in meaning. The greatness of God's unfailing love and the greatness of his faithfulness are spoken of as if they could be measured in distance. (See: [[rc://en/ta/man/translate/figs-parallelism]] and [[rc://en/ta/man/translate/figs-metaphor]])
The greatness of God's unfailing love is spoken of as if it could be measured in distance. AT: "Your unfailing love is as great as the distance from the earth to the heavens" (See: [[rc://en/ta/man/translate/figs-metaphor]])
The words "great is your" and "reaching" are understood from the previous phrase. AT: "great is your faithfulness, reaching to the clouds" or "your faithfulness is as great as the distance from the earth to the clouds" (See: [[rc://en/ta/man/translate/figs-ellipsis]] and [[rc://en/ta/man/translate/figs-metaphor]])
The psalmist is asking God to show that he is exalted. Being exalted above the heavens represents being great. AT: "God, show that you are exalted above the heavens" or "God, show that you are great in the heavens" (See: [[rc://en/ta/man/translate/figs-metaphor]])