The evidence of the Holy Ghost is not speaking in tongues.

If you yourself do not know what you are saying, how do you know you are not cursing the Lord or others?

Evidence of the Holy Ghost is hearing the truth and doing it.

The Holy Ghost is the spirit of truth. John 15:26-27 KJV says, But when the Comforter is come, whom I will send unto you from the Father, even the Spirit of truth, which proceedeth from the Father, he shall testify of me: [27] And ye also shall bear witness, because ye have been with me from the beginning.

Further, James 1:22 KJV tells us, But be ye doers of the word, and not hearers only, deceiving your own selves.