I will praise you with an upright heart as I learn your righteous laws.
NIV
I will praise and give thanks to You with uprightness of heart when I learn [by sanctified experiences] Your righteous judgments [Your decisions against and punishments for particular lines of thought and conduct].
AMP
I will praise thee with uprightness of heart, when I shall have learned thy righteous judgments.
KJV
I have strayed like a lost sheep. Seek your servant, for I have not forgotten your commands.
NIV
I have gone astray like a lost sheep; seek, inquire for, and demand Your servant, for I do not forget Your commandments. [Isa. 53:6; Luke 15:4; I Pet. 2:25.]AMP
I have gone astray like a lost sheep; seek thy servant; for I do not forget thy commandments.
KJV