Aquinas was a medieval European philosopher. You can think of what he is talking about in terms of "good" being a metric of ethics, usually paired with an "evil" (like justice vs injustice).
As another example, health and sickness are another pair of metrics: we act ethically when we strive for health rather than sickness.
More generally Aquinas sees God as the source of all good and thus we should strive towards union with God. One of his attributes is justice. So since righteous anger looks towards justice, which points towards God ultimately, we are acting good or godly when angry at injustices.
And conversely, not only are you unjust otherwise, you are also falling further from God.
Aquinas was a medieval European philosopher. You can think of what he is talking about in terms of "good" being a metric of ethics, usually paired with an "evil" (like justice vs injustice).
As another example, health and sickness are another pair of metrics: we act ethically when we strive for health rather than sickness.
More generally Aquinas sees God as the source of all good and thus we should strive towards union with God. One of his attributes is justice. So since righteous anger looks towards justice, which points towards God ultimately, we are acting good or godly when angry at injustices.
And conversely, not only are you unjust otherwise, you are also falling further from God.
Thank you for elaborating in detail! I understand it! Many thanks!