כֹּ֥ה אָמַ֖ר יְהוָ֣ה צְבָא֑וֹת שִׂ֥ימוּ לְבַבְכֶ֖ם עַל־דַּרְכֵיכֶֽם׃
나 만군의 여호와가 말하노니 너희는 자기의 소위를 살펴 볼지니라
Mesillat Yesharim
The second: on the actions which he does, to determine if they are in the category of the good or the evil.
Mesillat Yesharim
This applies both to times when he is in the act of doing and when not in the act of doing.