How to demonstrate the presence of the Holy Spirit in us except by signs of languages?
Now the works of the flesh are manifest, and I'm: fornication, impurity, dissolutezza, idolatry, witchcraft, enmity, discord, jealousy, ire, disputes, divisions, sète, envy, drunkenness, orgies and other such things; about which, as I have already told you, I notice you: whoever does such things will not inherit God's kingdom.
The FRUIT OF THE SPIRIT, on the other hand, is love, joy, pace, patience, kindness, goodness, fidelity, gentleness, restraint; against such things there is no law. Those who are Christ's have crucified the flesh with its passions and desires if we live by the Spirit, we also walk guided by the Spirit. (Galati 5:19-25)
Languages are not mentioned at all (also because they speak in tongues even in pagan religions, Hindu and African), it is the fruits of the spirit written above that prove the presence of the Holy Spirit in us.
Also in 1 Corinthians 13:8 we read that languages (and the prfoezie) they would cease and Love would remain as a sign among Christians:
Love never fails. Prophecies will be abolished; tongues will cease; and knowledge will be abolished.