Psalm 26:1

Vindicate me, O Lord, for I have walked in my integrity; I have (relied on and) trusted (confidently) in the Lord without wavering and I shall not slip. 

When we have done all we know to do, we keep standing on the Word. Our answer is coming, and our vindication is around the corner. We have trusted in the Lord and have not slipped. Then we keep standing because we have the Word of God, and God will not leave us helpless.