Matsya Purana 221.6

221.6

karmaṇā prāpyate loke rājasasya tathā phalam.
kṛcchreṇa karmaṇā viddhi tāmasasya tathā phalam .. 221.5 ..

Rajoguna class of men get fruits according to their perseverance and efforts A, man, by perseverance gets what he wants Those who have performed Tamoguna deeds attain their desires with great difficulty Those who are incapable of persevering regard fate alone as supreme Know, O King! that men get all their desired ends by their energy and efforts.—5 6