Had there been falsehood in my breast

Had there been falsehood in my breast
No doubt had marr'd my word;
This spirit had not lost its rest,
These tears had never flowed.

I gazed upon the cloudless moon
And loved her all the night,
Till morning came and radiant noon,
And I forgot her light.

No, not forgot eternally
Beneath its mighty glare:
But could the day seem dark to me
Because the night was fair?