תִּכְבַּ֧ד הָעֲבֹדָ֛ה עַל־הָאֲנָשִׁ֖ים וְיַעֲשׂוּ־בָ֑הּ וְאַל־יִשְׁע֖וּ בְּדִבְרֵי־שָֽׁקֶר׃
Tornem mais pesado o trabalho sobre os homens, e eles trabalharão nele, e não confiem em palavras falsas."
Mesillat Yesharim
This is similar to the wicked Pharaoh's advice saying "intensify the men's labor..." (Ex. 5:9). His intention was to leave them no time whatsoever to oppose him or plot against him. He strove to confound their hearts of all reflection by means of the constant, incessant labor.
Mesillat Yesharim
The first: that he contemplate what is the true good for man to choose and what is the true evil for him to flee from.
Mesillat Yesharim
The second: on the actions which he does, to determine if they are in the category of the good or the evil.