Bible Verses About Public Prayer: Should not be made in an unknown language

For if I pray in a strange togue, my spirit prayeth: but mine vnderstading is without fruite.

What is it then? I will pray with the spirit, but I wil pray with the vnderstanding also: I wil sing with the spirite, but I will sing with the vnderstanding also.

Else, when thou blessest with the spirit, howe shall hee that occupieth the roome of the vnlearned, say Amen, at thy giuing of thankes, seeing he knoweth not what thou sayest?