Vīrya (Sanskrit; Pāli: viriya; Tibetan Wylie: brtson 'grus) is a Buddhist term commonly translated as "energy", "diligence", "enthusiasm", or "effort". It can be defined as an attitude of gladly engaging in wholesome activities, and it functions to cause one to accomplish wholesome or virtuous actions.

Vīrya literally means "state of a strong man" or "manliness." In Vedic literature, the term is often associated with heroism and virility. In Buddhism, the term more generally refers to a practitioner's "energy" or "exertion," and is repeatedly identified as a necessary prerequisite for achieving liberation.

In Buddhist contexts, viriya has been translated as "energy," "persistence," "persevering," "vigour," "effort," "exertion," or "diligence."

Virya is identified as a mental factor within both the Theravada and Mahayana Abhidharma teachings. In this context, virya is defined the attitude of gladly engaging in what is wholesome; its function is to cause one to accomplish wholesome actions.

The Abhidharma-samuccaya states:

Christophe Bertrand (24 April 1981 – 17 September 2010) was a French composer of contemporary classical music.

Christophe Bertrand was a French pianist and composer of mainly chamber works born in 1981. After earning gold medals for piano and chamber music at the Strasbourg Conservatoire, he performed and recorded with the Ensemble Accroche-Note and the Ensemble In Extremis of which he was a co-founder. He collaborated with composers such as Ivan Fedele and Pascal Dusapin.

He studied composition since 1996, under the supervision of Ivan Fedele at the Strasbourg Conservatoire, obtaining with distinction his diploma in 2000.

His compositions, conducted among others by Pierre Boulez, Jonathan Nott, Hannu Lintu, Marc Albrecht have been performed by several ensembles and soloists such as the Ensemble Intercontemporain, Arditti Quartet and the Orchestre philharmonique de Strasbourg.

His compositions have been played internationally, amongst others in:

French radio channel France Musique provided his compositions airtime.