הִנֵּה־בֵ֞ן נוֹלָ֣ד לָ֗ךְ ה֤וּא יִהְיֶה֙ אִ֣ישׁ מְנוּחָ֔ה וַהֲנִח֥וֹתִי ל֛וֹ מִכָּל־אוֹיְבָ֖יו מִסָּבִ֑יב כִּ֤י שְׁלֹמֹה֙ יִהְיֶ֣ה שְׁמ֔וֹ וְשָׁל֥וֹם וָשֶׁ֛קֶט אֶתֵּ֥ן עַל־יִשְׂרָאֵ֖ל בְּיָמָֽיו׃
Mesilat Yesharim
The means through which Zeal is acquired are the same ones through which Watchfulness is acquired, and their levels are likewise similar as I wrote earlier.