From
苏轼《稼说送张琥》 (Su Shi, Northern Song):
博观而约取，
厚积而薄发 (observe widely but take sparingly; accumulate deeply but release sparingly). Written as advice to his friend Zhang Hu on an agricultural metaphor - a field must be deeply turned and well-rested before it yields. A gold-standard motto in Chinese education, often inscribed in schools and libraries.
