Poems

I can't believe my luck! I could log into my blog from office!... I was reading two of my favourite poems and am going to paste an excerpt of each here. First one is famous, so no points if you can guess the poem and author. Here it is...

"IF you can keep your head when all about you
Are losing theirs and blaming it on you,
If you can trust yourself when all men doubt you,
But make allowance for their doubting too;
If you can wait and not be tired by waiting,
Or being lied about, don't deal in lies,
Or being hated, don't give way to hating,
And yet don't look too good, nor talk too wise: ..."

The second one is uncommon, though I am sure all of us have come across it sometime or the other. If you can guess the source of this poem (without googling), then give yourself full marks.
NB : I think you are old enough to define what ‘full’ means to you.
Warning : Don’t try to decipher the meaning of this poem.

They told me you had been to her, And mentioned me to him : She gave me a good character, But said I could not swim.
He sent them word I had not gone (We know it to be true): If she should push the matter on, What would become of you?
.
.
If I or she should chance to be Involved in this affair, He trusts to you to set them free, Exactly as we were.
.
Don't let him know she liked them best, For this must ever be A secret, kept from all the rest, Between yourself and me.