Lord Chaitanya has given special stress to chanting of these holy names of the Lord as the basic principle of spiritual advancement.
Purport on Srimad Bhagavatam 3.29.18
As long as our consciousness is materialistic, there is no room for joy. However on the spiritual platform three things automatically happen: eternity, knowledge and bliss.
Spirituality is revival of our God consciousness, not creating something new.
A living entity becomes aware of his Spiritual Identity and becomes aware of the Supreme Personality of Godhead only when he comes accross a Sprititual Master.
To struggle is difficult but to surrender is easy. Surrender is the beginning of devotion.