The Kitáb-i-Aqdas
Notes
91.This is My bidding unto you; hold fast to it as an assistance to yourselves.   ¶63
While marriage is enjoined in the Kitáb-i-Aqdas, Bahá’u’lláh clarifies that it is not obligatory (Q&A 46). Shoghi Effendi, in a letter written on his behalf, also declared that “marriage is by no means an obligation,”1 and he affirmed that “in the last resort, it is for the individual to decide whether he wishes to lead a family life or live in a state of celibacy.” If a person has to wait a considerable period of time before finding a spouse, or ultimately must remain single, it does not mean that the individual is thereby unable to fulfil his or her life's purpose, which is fundamentally spiritual.
 
1 May 3 1936 : Lights of Guidance, p. 379, no. 1267; Messages from the Universal House of Justice, 1968-1973, pp. 109-110