The Book of Psalms, including the Sidney Psalter, is concerned with being righteous.
There are pious apologies (i. e. in Psalms 31 and 51) that blame God (i. e. in Psalm 22) and others (i. e. Psalm 109), when people are not completely sinless.
However, this may be due to the recurring theme of judgement, of separating out the sinners from the righteous.
This begins Psalm 1, where the wheat is literally sorted from the "chaff" – "the wicked, but like chaff" (Sidney, 2009, p. 11).

"Not with the just, be their meetings placed" (Sidney, 2009, p. 11).
This may be one of the most commonly recurring themes in the Psalter.
Here are a few examples:
Psalm 11:
"on them: storms, brimstone, coals he rains:
that is their share assigned.

But so of happy other side."

(Sidney Psalter, 2009, p. 218)
Psalm 145:
"He will his lovers all preserve;
He will the wicked all destroy."

(The Sidney Psalter, 2009, p. 279)
One way in which the righteous and the sinful are often separated is by the path they choose.
Psalm 1 sees two paths laid out for man "ruin's way" where "wicked counsel leads" or the way of God.
Paths or "the way", especially choosing the right path, is a common theme throughout the whole bible, but also within the psalms.
Phillip Sidney sets up this theme firmly in Psalm 1 with the opening line referring to "tread[ing]" the right path.
This path can be seen as the beginning of a journey the psalms and through this lyrical Psalter.

Other references to paths in the Psalter include:
Psalm 16: 
"Thou life's path wilt make me know"
(Sidney Psalter, 2009, p. 31)
Psalm 119:
"and to thy paths will have a good eye"
(Sidney Psalter, 2009, p. 230)
The Book of Psalms, including the Sidney Psalter, is concerned with being righteous. There are pious apologies (i. e. in Psalms 31 and 51) that blame God (i. e. in Psalm 22) and others (i. e. Psalm 109), when people are not completely sinless. However, this may be due to the recurring theme of judgement, of separating out the sinners from the righteous. This begins Psalm 1, where the wheat is literally sorted from the "chaff" – "the wicked, but like chaff" (Sidney, 2009, p. 11).
"Not with the just, be their meetings placed" (Sidney, 2009, p. 11). This may be one of the most commonly recurring themes in the Psalter. Here are a few examples:
Psalm 11:
"on them: storms, brimstone, coals he rains:
that is their share assigned.
But so of happy other side."
(Sidney Psalter, 2009, p. 218)
Psalm 145:
"He will his lovers all preserve;
He will the wicked all destroy."
(The Sidney Psalter, 2009, p. 279)
One way in which the righteous and the sinful are often separated is by the path they choose. Psalm 1 sees two paths laid out for man "ruin's way" where "wicked counsel leads" or the way of God. Paths or "the way", especially choosing the right path, is a common theme throughout the whole bible, but also within the psalms. Phillip Sidney sets up this theme firmly in Psalm 1 with the opening line referring to "tread[ing]" the right path. This path can be seen as the beginning of a journey the psalms and through this lyrical Psalter.
Other references to paths in the Psalter include:
Psalm 16: 
"Thou life's path wilt make me know"
(Sidney Psalter, 2009, p. 31)
Psalm 119:
"and to thy paths will have a good eye"
(Sidney Psalter, 2009, p. 230)
Sidney Psalms