Vairagya (वैराग्य) is a Sanskrit word which means dispassion, detachment, or renunciation from the objects and pleasure of the material world. Vairagya is considered as initial state for aspirant who want to understand self-knowledge ( or attain moksha)
Vairagya refers to state of mind rather than to external lifestyle and can be practiced equally well by one engaged in duties of life. Vairagya does not mean suppression of desire and attachments for objects. By the application of Viveka (spiritual discrimination or discernment), the aspirant gradually develops vairagya towards the material objects.
वैराग्य – विरागस्य भावः ( विराग + ष्यञ् )
Vairagya-Shatakam ( वैराग्यशतकम् )
Vairagya Shatakam is famous book written by Bharthari (भर्तृहरि) which includes 100 verses on renunciation.
Here is the link for the book – Vairagya Shatakam (वैराग्यशतकम्)