O Lord, open thou my lips
The Targum adds, "in the late"; which were shut with a sense of
sin, with shame of it, and sorrow for it; and though they were in
some measure opened in prayer to God for the forgiveness of it,
as appears by various petitions in this psalm, yet he still
wanted a free spirit and boldness at the throne of grace, which
the believer has when his heart is sprinkled from an evil
conscience by the blood of Christ; and especially his lips were
shut as to praise and thanksgiving; the guilt of sin had sealed
up his lips, that he could not sing the praises of God as he had
formerly done; and only a discovery of pardoning grace could open
them, and for this he prays:
and my mouth shall show forth thy praise:
the praise of his mercy, grace, goodness, truth, and
faithfulness, in psalms, hymns, and spiritual songs; see (
Psalms
103:1-3 ) .