Since you know that you will receive an inheritance from the Lord as a reward. It is the Lord Christ you are serving.
NIV
Knowing [with all certainty] that it is from the Lord [and not from men] that you will receive the inheritance which is your [real] reward. [The One Whom] you are actually serving [is] the Lord Christ (the Messiah).
AMP
Knowing that of the Lord ye shall receive the reward of the inheritance: for ye serve the Lord Christ.
KJV
And over all these virtues put on love, which binds them all together in perfect unity.
NIV
And above all these [put on] love and enfold yourselves with the bond of perfectness [which binds everything together completely in ideal harmony].
AMP
And above all these things put on charity, which is the bond of perfectness.
KJV
Fathers, do not embitter your children, or they will become discouraged.
NIV
Fathers, do not provoke or irritate or fret your children [do not be hard on them or harass them], lest they become discouraged and sullen and morose and feel inferior and frustrated. [Do not break their spirit.]AMP
Fathers, provoke not your children to anger, lest they be discouraged.
KJV