'Mayest' in the Bible

But and if thou mayest marry, thou didst not sin; and if the virgin may marry, she did not sin; and such shall have tribulation in the flesh: and I spare you.

since, if thou mayest bless with the spirit, he who is filling the place of the unlearned, how shall he say the Amen at thy giving of thanks, since what thou dost say he hath not known?