"Do not grow weary of doing good..."
Why would he say that? -Because doing good involves... well, doing. And doing involves... well, weariness. And selflessness. And work. And time. And trouble. And risk.
BTW, it's easier not to. It's easier to focus on self. It's easier to look the other way. In fact, It's easier to not "do" at all.
It's easier to make excuses.
If I start "doing" -it may…