Passage
Surely thou wilt slay the wicked, O God: depart from me therefore, ye bloody men.
Surely thou wilt slay the wicked, O God: depart from me therefore, ye bloody men.
Psalms 139:17 How precious also are thy thoughts unto me, O God! how great is the sum of them!
Psalms 139:18 If I should count them, they are more in number than the sand: when I awake, I am still with thee.
Psalms 139:19 Surely thou wilt slay the wicked, O God: depart from me therefore, ye bloody men.
Psalms 139:20 For they speak against thee wickedly, and thine enemies take thy name in vain.
Psalms 139:21 Do not I hate them, O LORD, that hate thee? and am not I grieved with those that rise up against thee?
The verse centers on "surely", "thou", "wilt", "slay", "wicked", "depart", "therefore", and "bloody". It is saying that the verse draws attention to "surely" and "thou", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 18's "If I should count them they are..." into verse 20's "For they speak against thee wickedly and...", so "surely" and "thou" belong inside that flow. In Psalms context, the local focus is worship, trust, the LORD's kingship, and covenant mercy.
A plain takeaway is to answer the verse's own emphasis on "surely" and "thou" with trust shaped by these words, not by a vague optimism outside the passage.