Withhold not thou thy tender mercies from me, O LORD: let thy lovingkindness and thy truth continually preserve me.
Withhold not thou thy tender mercies from me, O Lord - even as I have not withheld (the Hebrew verb, tiklaa' (H3607), here is the same as in Psalms 40:9, "refrained") my lips from thy praises. The measure of further "mercies" is proportional to the degree of thankfulness for mercies already vouchsafed.
Let thy loving-kindness and thy truth continually preserve me - even as "I have not concealed thy loving-kindness and thy truth from the great congregation" (Psalms 40:10).