Ibn `Abbas [may Allah be pleased with him] said
‘Indeed good actions are a light in the heart,
a strengthening for the body,
a glow on the face,
a cause for extensive provisions and
love in the hearts of the creation.
Indeed bad actions are a darkness in the heart,
a blackness on the face,
a weakness for the body,
a cause for decrease in provisions and
hatred in the hearts of the creation.
as mentioned by ibn al-Qayyim [rahimahullah] in al Jawab al Kafi.