Psalm 129

129:1 “Greatly have they afflicted me from my youth”—
let Israel now say—
2 “Greatly have they afflicted me from my youth,
yet they have not prevailed against me.
3 The plowers plowed upon my back;
they made long their furrows.”
4 The Lord is righteous;
he has cut the cords of the wicked.
5 May all who hate Zion
be put to shame and turned backward!
6 Let them be like the grass on the housetops,
which withers before it grows up,
7 with which the reaper does not fill his hand
nor the binder of sheaves his arms,
8 nor do those who pass by say,
“The blessing of the Lord be upon you!
We bless you in the name of the Lord!”

Who has been after you for a long time? I can think of difficulty and evil but a particular person or group of people is hard, if they have been at it I've been completely unaware. The Psalmist has felt it, they really have made him suffer, and God is his deliverance.