Romans 8:26a English Standard Version (ESV) Likewise the Spirit helps us in our weakness.

I have a weakness for coffee ice cream. I am a controlled diabetic. This is not the weakness Paul is addressing in Romans 8:26. What I call weakness is the strength to resist temptation. 

I do not give in to that temptation all the time. What I do is wait until I have my lab results after six months and if my A1C is 6.0 t0 6.3 I celebrate by getting some coffee ice cream and cheat on my diet.

Am I sinning?

In the perfect definition of sinning, yes because I know what I should do and I justify my actions to do that which is not good for me. It is cheating and cheating is not a spiritually sound word.

When we justify our actions to choose to do what is wrong, it is a bad habit that might leak over into another aspect of our lives that will be more harmful in our relationships that should take priority.

Our Lord has told us to love one another. What rationalizations have we used to disobey Him?

I had siblings that said they were spiritual but they did not love me. The fact that they did not love me justify my withholding love from them?

That is an extreme example of a spiritual truth. We should not stop loving others just because they have done nothing to deserve it. If Jesus had felt that way we would all be lost and suffering in sin because He would not have gone to the cross for us. But He did and we should remember that when others are acting unworthy.

Romans 8:26b English Standard Version (ESV) For we do not know what to pray for as we ought, but the Spirit himself intercedes for us with groanings too deep for words.

So we do not pray for them as we ought, but thanks be to God that His Spirit is stronger than our weakness and will do the right thing.

Knowing that the Spirit will pray when we will not is not justification to withhold prayer.

We are still commanded to love and prayer is an act of love.

There is a prayer of David that means “have your way with me Lord.” Pray it.