Only God is perfect: The LORD is good to those whose hope is in him, to the one who seeks him. Lamentations 3:25

After the conquest and destruction of Jerusalem in 587 BC by the tyrant Nebuchadnezzar, not all of the city's inhabitants were deported; a small remnant, the poorest individuals of the city, were able to remain, and it is to this group and not to the prophet Jeremiah, that the authorship of the Book of Lamentations is attributed.
The Book, divided into five parts called lamentations, poetically expresses the situation of desolation and uncertainty that the surviving Jews had to endure. But the book also contains an ardent and devotional plea to God for the restoration of his divine promises.
And this supplication is based on a very specific sapiential teaching, only God is perfect, and just as the Sun radiates its perfections to men, God radiates his spiritual gifts and blessings to men. But for this wisdom and perfection of God to materialize and penetrate inside the mind of men, they must desire to receive the gifts of the Lord, in other words, men must have a heart prepared to receive God's mercy (compassion, gentleness, kindness), because sin breaks the relationship with God, and the law of Moses leaves no doubt: "Fear God and keep his commandments, for this is the whole duty of man", Ecclesiastes 12:13.
This is why the Book of Lamentations called to the survivors to reflect on their own behaviors:
"Let us examine our ways and test them,
and let us return to the LORD" Lamentations 3:40.
It is logical to put the hope in the eternal goodness of God, God is not good because he does good things, but rather because God is good he does good things, the Lord is the source of the good, that is why the book continued with the reflection:
"The LORD is good to those whose hope is in him,
to the one who seeks him;
it is good to wait quietly
for the salvation of the LORD" Lamentations 3:25-26.
And this hope based on the goodness of God was realized with the arrival of Cyrus the Great, who allowed the return of the exiled Jews and the reconstruction of Jerusalem under the rule of the Persian empire.

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