The quote is from Garden Witchery by Ellen Dugan.
I believe anyone who plants anything is also planting a little bit of hope. But especially trees. The person who plants a tree will probably never see how it finally looks after fifty or a hundred years, but they plant them anyway. So, believe in the future and go get dirty. If you don't have room for a tree, plant some bulbs, lavender, anything.
Well, almost anything. LOL