For thy lovingkindness is before mine eyes: and I have walked in thy truth.
Before mine eyes - rather understand, '(has been) before mine eyes,' as the spring of my outward aversion from sin and sinners (Psalms 26:4-5).
Walked in thy truth - I have, in my whole walk, rested in THY truth - i:e., thy faithfulness to thy promise (Psalms 25:5, note).