מְתוּקָה֙ שְׁנַ֣ת הָעֹבֵ֔ד אִם־מְעַ֥ט וְאִם־הַרְבֵּ֖ה יֹאכֵ֑ל וְהַשָּׂבָע֙ לֶֽעָשִׁ֔יר אֵינֶ֛נּוּ מַנִּ֥יחַֽ ל֖וֹ לִישֽׁוֹן׃
Doux est le sommeil du laboureur, qu’il mange peu ou prou tandis que la satiété ne laisse pas dormir le riche.
Derech Etz Chayim (Ramchal)
The general idea is that someone who doesn't ponder these things will find it very difficult to reach perfection and vice versa. The sages are constantly engaged in this exercise and therefore find success in their endeavors. Those with limited capability should nevertheless set times to take to heart these matters, whether a maximum or minimum effort, and see success in their quest towards perfection.