“Those who do not have enough patience will not reap the fruits of wisdom. This is because the tree of virtue takes time to bear fruit.”
Related quotes

Opening address to the National Day of Prayer in Suva, 15 May 2005 (excerpts) http://www.fiji.gov.fj/publish/page_4607.shtml

“Without courage, wisdom bears no fruit.”

Source: The Freedom of a Christian (1520), pp. 74-75

"Strange Fruit" (1939). Though Holiday's renditions made this anti-lynching song famous, it was written by Abel Meeropol (using his pseudonym "Lewis Allen").
Misattributed

http://nofilmschool.com/2016/07/abbas-kiarostami-death-cinema-lessons