Confidence

Psalm 119: 167 - My soul keeps your testimonies, and I love them exceedingly
Let not our consciousness of daily failures make us shrink from this strong expression of confidence. It is alleged as an evidence of grace, not as a claim of merit, and therefore the most humble believer need not hesitate to adopt it as the expression of Christian sincerity before God. David aspired to no higher character than that of a poor sinner: but he was conscious of spirituality of obedience, "exceeding love" to the divine word, and an habitual walk under the eye of his God— the evidences of a heart (often mentioned in the Old Testament) "perfect with him." 

Charles Bridges, quoted in Charles Spurgeon's The Treasury of David. 

Bridges (1794-1869)was a preacher and theologian in the Church of England, and a leader of that denomination's Evangelical Party. As a preacher he was well regarded by his contemporaries, but is remembered today for his literary contributions. He also wrote an exposition on Psalm 119, when he was only 33. The book went through twenty-four editions before his death, is still available and is somewhat shorter - at 534 pages - than Spurgeon's massive tome.