Isn't someone who has attained Righteousness someone who ALREADY upholds the commandments of Christ?
Someone who desires to uphold Christs commandments and still needs instruction in Old Testament Law is someone who still hasn't attained to the Righteousness which is found in the faith of Christ.
Of course, how do you teach someone who thinks he already knows? Its the reason why Christ said you have to come to Him as a little child, not knowing anything. Because, in reality, we don't know anything when we come to Christ.
Lets get to the bottom of this
In rom 3- the word used is histemi
Defenition gave above....
The word uphold is found in 1 thess 5: 14
In the greek the word is antecho
ἀντ-έχω or ἀντ-ίσχω: f. ἀνθ-έξω: aor. 2 ἀντ-έσχον:—to hold against, c. acc. et gen., χεῖρα ἀντ. κρατός to hold ones hand against ones head, so as to shade the eyes, Soph.; c. dat., ὄμμασι δʼ ἀντίσχοις τάνδʼ αἴγλαν mayst thou keep this sunlight upon his eyes (al. off his eyes), Id.
II. to hold out against, withstand, c. dat., Hdt., Thuc.; πρός τινα Thuc.; c. acc. to endure, Anth.
2. absol. to hold out, stand ones ground, Hdt., Att.: to hold out, endure, last, Hdt., etc.; of the rivers drunk by the Persian army, to hold out, suffice, Id.
III. Med. to hold before one against something, c. acc. et gen., Od.
2. c. gen.
to hold on by, cling to, Hdt., Att.:—metaph., ἀντ. τῶν ὄχθων to cling to the banks, keep close to them, Hdt.; ἀντ. ἀρετῆς, τοῦ πολέμου Id.; τῆς θαλάσσης Thuc.
3. absol. to hold out, Soph.
4. c. dupl. gen. pers. et rei, ἀνθέξεταί σου τῶν χρημάτων will lay claim to the property from you, dispute it with you, Ar.
As you can see, they are not even the same word. And do not have the same meaning