...and then, I have nature and art and poetry, and if that is not enough, what is enough?

The line expresses a defiant, self-consoling credo: even when ordinary sources of stability—money, health, social belonging, romantic fulfillment—fail, the speaker still possesses inexhaustible inner resources in the form of nature, art, and poetry. The rhetorical question (“if that is not enough, what is enough?”) turns scarcity into abundance, suggesting that aesthetic attention and creative work can constitute a sufficient life. In van Gogh’s case (if authentic), it resonates with his habit of treating artistic vocation and the natural world as spiritual sustenance, a counterweight to loneliness and hardship, and a measure of “enough” not defined by conventional success.