מְתוּקָה֙ שְׁנַ֣ת הָעֹבֵ֔ד אִם־מְעַ֥ט וְאִם־הַרְבֵּ֖ה יֹאכֵ֑ל וְהַשָּׂבָע֙ לֶֽעָשִׁ֔יר אֵינֶ֛נּוּ מַנִּ֥יחַֽ ל֖וֹ לִישֽׁוֹן׃
זיס איז דער שלאָף פֿון דעם װאָס אַרבעט, סײַ ער עסט װינציק, סײַ פֿיל, אָבער די זעט פֿון דעם עושר לאָזט אים ניט שלאָפֿן.
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.