'By The Spirit' in the Bible

and such were some of you: but you have been washed, you have been sanctified, you have been justified in the name of the Lord Jesus Christ, and by the spirit of our God.

for he that speaks in an unknown tongue, speaks not to men, but to God: for no man can understand the mysteries he delivers by the spirit.

what then is to be done? why, I will pray by the spirit, but my prayer shall be intelligible: I will sing by the spirit, but my hymn shall be intelligible.

otherwise if you should give thanks by the spirit in an unknown tongue, the hearer cannot but appear unlearned upon this occasion; how then can he say Amen to thy thanksgiving? since he does not conceive what you say.