Arthur Hugh Clough Quote

Put forth thy leaf, thou lofty plane,
East wind and frost are safely gone;
With zephyr mild and balmy rain
The summer comes serenely on;
Earth, air, and sun and skies combine
To promise all that's kind and fair:—
But thou, O human heart of mine,
Be still, contain thyself, and bear.

In a London Square, st. 1.