Psalms 119:4

Thou hast commanded us to keep Thy precepts diligently.

Reasons for diligence in obeying God

In worldly affairs no weighty thing can be done without diligence; far less in spiritual. For three causes should we keep the commandments of the Lord with diligence: first, because our adversary, that seeks to snare us by the transgression of them, is diligent in tempting; next, because we ourselves are weak and infirm; by the greater diligence have we need to take heed to ourselves; thirdly, because of the great loss we sustain by every advantage Satan gets over us. For we find by experience that as a wound is sooner made than it is healed, so guiltiness of conscience is easily contracted, but not so easily done away. (Bishop Cowper.)