Any one who loves to give gifts/time/service knows that sometimes, the heart can get in the way of our gifts and purpose.
Ex: We start expecting thanks, reciprocation, and sadly, in the long run---We burn out, reach long standing disappointment and lots of other selfish icky things.
The Word warns us of motives and our hearts (yikes, which can be just plain ugly).
Good news! We are redeeemed and forgiven and made holy, again. Thank you, Jesus for your blood.
We demolish arguments and every pretension that sets itself up against the knowledge of God, and we take captive every thought to make it obedient to Christ. 2 Cor 10:5
“Therefore, if anyone is in Christ, he is a new creation. The old has passed away; behold, the new has come.” (2 Cor. 5:17).
I have stored up your word in my heart, that I might not sin against you. Ps 119:11