A Psalm of David.
Do not fret because of evildoers,
Nor be envious of the workers of iniquity.
If you are like me you have probably been in the habit of ignoring the little headings, like the one above, "A Psalm of David".
The word picture for psalm is "to cut off the bitterness of chaos".
Given that the word picture for thoughts is "silent balance of chaos" it would appear to me that a daily dose of the Psalms (to cut off the bitterness of chaos) is essential as we rise from chaos into the fullness of our God given purpose.