William Schwenck Gilbert - The Mighty Must

Come mighty Must!
Inevitable Shall!
In thee I trust.
Time weaves my coronal!
Go mocking Is!
Go disappointing Was!
That I am this
Ye are the cursed cause!
Yet humble Second shall be First,
I ween;
And dead and buried be the curst
Has Been!

Oh weak Might Be!
Oh May, Might, Could, Would, Should!
How powerless ye
For evil or for good!
In every sense
Your moods I cheerless call,
Whate'er your tense
Ye are Imperfect, all!
Ye have deceived the trust I've shown
In ye!
Away! The Mighty Must alone
Shall be!

William Schwenck Gilbert

http://www.poemhunter.com/poem/the-mighty-must/