Vedic Wisdom of today.

Thus, due to their helpless and pathetic condition, the living entities in Kali-yuga have great impetus to surrender fully to the holy name of Kṛṣṇa, putting all of their hope and faith in the Lord’s holy name. Kali-yuga is therefore the best age because in this age, more than in Satya-yuga or other ages, the conditioned souls become disgusted with the kingdom of illusion and surrender fully to the Lord’s holy name. This status of full surrender is called paramāṁ śāntim, or supreme peace.

Source : https://vedabase.io/en/library/sb/11/5/37/

The Hare Krsna mantra is specifically mentioned in many Upanisads, such as the Kali−santarana Upanisad, where it is said:

hare krsna hare krsna krsna krsna hare hare
hare rama hare rama rama rama hare hare

itisodasakam namnam kali −kalmasa−nasanam
natah parataropayah sarva−vedesu drsyate

“After searching through all the Vedic literature one cannot find a method of religion more sublime for this age than the chanting of Hare Krsna.”

– Sri Caitanya caritamrta Adi lila 3.40

Source : https://harekrishnajapa.com/archives/259