The Book of PsalmsPsalm 100
Misericordiam et judicium. The prophet exhorteth all by his example, to follow mercy and justice.
The Douay-Rheims numbers the Psalms as the Latin Vulgate does. In Bibles translated from the Hebrew this is Psalm 101. Read Psalm 101 in the WEBC.

100A psalm for David himself. Mercy and judgment I will sing to thee, O Lord: I will sing,
2And I will understand in the unspotted way, when thou shalt come to me. I walked in the innocence of my heart, in the midst of my house.
3I did not set before my eyes any unjust thing: I hated the workers of iniquities.
4The perverse heart did not cleave to me: and the malignant, that turned aside from me, I would not know.
5The man that in private detracted his neighbour, him did I persecute. With him that had a proud eye, and an unsatiable heart, I would not eat.
6My eyes were upon the faithful of the earth, to sit with me: the man that walked in the perfect way, he served me.
7He that worketh pride shall not dwell in the midst of my house: he that speaketh unjust things did not prosper before my eyes.
8In the morning I put to death all the wicked of the land: that I might cut off all the workers of iniquity from the city of the Lord.
Notes by Bishop Challoner
- 2 I will understand. That is, I will apply my mind, I will do my endeavour, to know and to follow the perfect way of thy commandments: not trusting to my own strength, but relying on thy coming to me by thy grace.