Charles H. Spurgeon on Psalms 68:9

A liberal rain. The words translated a liberal rain, read literally in the Hebrew a rain of freenesses; and I agree with interpreters in thinking that he alludes to the blessing as having come in the exercise of free favour, and to God, as having of his own unprompted goodness provided for all the wants of his people. Some read, a desirable rain; others a rain flowing without violence, or gentle; but neither of these renderings seems eligible. Others read, a copious or plentiful rain; but I have already stated what appears to me to be the preferable sense. John Calvin.