The Lord is wise and perfect: Be merciful to me, O God, because of your constant love. Psalm 51:1

God is perfection to the highest degree, but man, his creature, is not. Man due to his imperfections and his capacity to choose freely is subject to error, to sin. This difference between God and his creature, man, shows us the true meaning of human life, man must strive in every way, however impossible it may seem, to achieve the resemblance to God. The gospel explains this teaching to us in a few words: "Be perfect, therefore, as your heavenly Father is perfect" Matthew 5:48.
The Psalmist, in Psalm 51, most probably King David who is the author of the book, recognizes his state of moral imperfection but wishes to be considered worthy, and to achieve the spiritual union with the wise God. The Psalm 51, is the psalm of the repentant sinner.
We are all sinners, no one is free from error, not even Jesus who on the cross and in his humanity, asks why God abandoned him. The psalmist, a pious and devoted man of God invokes the divine love to be forgiven by his sins adn be spiritually transformed by the creator, in his perfect likeness.
God forgive us, and irradiates us by his love his perfections, that is clean us from our sins and imperfections, but the man to receive these blessings must wish to live them, as expressed by the psalmist:
"Be merciful to me, O God,
because of your constant love.
Because of your great mercy
wipe away my sins!
Wash away all my evil
and make me clean from my sin!" Psalm 51:1-2.
The Psalmist wants to be wise as God is wise, give me wisdom in the heart says the psalmist and then continues, free me from the suffering of error:
"Cleanse me with hyssop, and I will be clean;
wash me, and I will be whiter than snow.
Let me hear joy and gladness;
let the bones you have crushed rejoice.
Hide your face from my sins
and blot out all my iniquity.
Create pure thoughts in me
and make me faithful again" Psalm 51:7-10.
God loves with benevolence those men who seek him with all their hearts, like Job, David or Solomon. Like them, we must all follow the path of the fear of God (constancy, firmness, devotion).

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