I am certain of nothing but the holiness of the heart's affections and the truth of imagination — what the imagination seizes as beauty must be truth… - John Keats

I am certain of nothing but the holiness of the Heart's affections and the truth of the Imagination.

Whatever the imagination seizes as Beauty must be truth -whether it existed before or not

Season of mists and mellow fruitfulness,
Close bosom-friend of the maturing sun;
Conspiring with him how to load and bless
With fruit the vines that round the thatch-eves run;
To bend with apples the moss’d cottage-trees,
And fill all fruit with ripeness to the core;
To swell the gourd, and plump the hazel shells
With a sweet kernel; to set budding more,
And still more, later flowers for the bees,
Until they think warm days will never cease,
For Summer has o’er-brimm’d their clammy cells.

As when, upon a tranced summer-night,
Those green-rob'd senators of mighty woods,
Tall oaks, branch-charmed by the earnest stars,
Dream, and so dream all night without a stir,
Save from one gradual solitary gust
Which comes upon the silence, and dies off,
As if the ebbing air had but one wave.

And lucent syrops, tinct with cinnamon.