King Solomon described Jehovah’s kindness in the context of a deep prayer:
Fearing God in our hearts does not mean we dread God or that we flee from him.
Fear of God implies fear of letting him down, fear of disrespecting him.
Whether or not a person is sincere in their service toward God can only be judged by God himself.
One is assured, however, that regardless of what we do, God pays to each his own.
Imagine someone in a dire situation.
He calls out to God, but God sees that he is insincere.
God does not forgive him.
Not even Jehovah God, the God of all love, kindness and forgiveness, forgives him, because that person is insincere and God can see through his facade.
That would be truly dreadful.
It is different, though, when one serves God.
If you sincerely strive to do what is good because you fear displeasing God, or if you sincerely repent, you can rest assured that Jehovah will listen to your prayer and bless you according to your ways, sooner or later (Ps. 145:16; Rev. 21:3-5).