עֵינַ֤י ׀ בְּנֶֽאֶמְנֵי־אֶרֶץ֮ לָשֶׁ֪בֶת עִמָּ֫דִ֥י הֹ֭לֵךְ בְּדֶ֣רֶךְ תָּמִ֑ים ה֝֗וּא יְשָׁרְתֵֽנִי׃
내 눈이 이 땅의 충성된 자를 살펴 나와 함께 거하게 하리니 완전한 길에 행하는 자가 나를 수종하리로다
Mesilat Yesharim
The Holy One blessed be He desires only faithfulness (honesty). In regard to this scripture states: "G-d guards those who are faithful" (Tehilim 31:24), and "Open the gates and let the righteous people that keep faith enter in" (Isaiah 26:2), and "My eyes shall be on the faithful of the land so that they may dwell with Me" (Tehilim 101:6), and "are Your eyes not to faithfulness?" (Jeremiah 5:3).
Mesilat Yesharim
Also, since one is prone to forgetfulness in these fine details, he will need diligent study in the books explaining these fine details to renew remembrance of them in his mind. Then certainly, he will be roused to fulfill them.
Mesilat Yesharim
However, the factors which cause loss of this trait are all those detriments to the trait of Watchfulness, in addition to lack of proficiency in knowledge of the laws and ethics (Mussarim) as I wrote above. Our sages already stated: "an ignorant man cannot be pious" (Avot 2:5). For one who does not know cannot possibly do. Likewise they taught "great is study in that it brings one to doing" (Kidushin 40b).