Psalms 13 - Wesley's Explanatory Notes

How long — Shall I be in such perplexities, not knowing what course to take?

Lighten — Revive and comfort, and deliver me from the darkness of death, which is ready to come upon me.

I will sing — It is a common thing for David and other prophets to speak of future deliverances as if they were already come, that so they may signify both the infallible certainty of the thing, and their firm assurance thereof.