There are times that you have to work hard and try hard. But there are times that you have to stop working and have to wait. If you know this, you are wise.
Wisdom begins with this kind of discernment that knows the boundaries.
We find similar notes of human limitations and humbling attitude in the Tao Te Ching (ch.71):
聖人不病 以其病病 是以不病
Transliteration: jibuljisang buljijibyung
sunginbulbyung igibyungbyung siibulbyung
More or less, what it means:
To know that you do not know is the best. While not knowing, your knowing is a disease. Only when you recognize the disease as a disease, you are free from the disease. The wise are free from the disease. They recognize the disease as a disease. Therefore it is not a disease.