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 allowances for their doubting too;
......and ends ...
Yours is the earth and everything that's in it
And - which is more - you'll be a man, my son.
"If I would have known then what I do now; I NEVER would have done that."
Then the Judge said: "If you proceed as planned, you WILL go to jail young man! Do you understand this?"
"If I had a dollar for every time she cheated on me, I'd be RICH!"
"Iffy" - Meaning that things are close to a true balance, but that it could go either way depending on what happens.