Ich aber bete zu dir, HERR, zur Zeit der Gnade; Gott, nach deiner großen Güte erhöre mich mit deiner treuen Hilfe.
In the NKJV, this is verse 13:
But as for me, my prayer is to You, O LORD, in the acceptable time; O God, in the multitude of Your mercy, hear me in the truth of Your salvation.
The repetition involved in the alliterative "großen Güte" (less concentrated but still present in the NKJV's "the multitude of Your mercy") provides a slight sense of this great abundance.
The Latin Vulgate (in which this is Psalm 68:14) also exhibits this alliteration:
mea autem oratio ad te Domine tempus reconciliationis est Deus in multitudine misericordiae tuae exaudi me in veritate salutaris tui
The high number of syllables in "multitudine misericordiae" also lends a sense of amount, especially because the surrounding words have far fewer.