What does Deuteronomy 15:9 mean?

Don't let selfish thoughts creep in, like thinking, 'The seventh year is almost here, so I don't want to lend anything.' If you refuse to help, they'll cry out to the Lord against you, and you'll be guilty. Deuteronomy 15:9 - Modern Text Bible

(Don't hold back generosity just because the debt might be canceled soon. God sees your motives and cares about your heart.)