"This world is a bridge. Pass over it; but do not build your dwelling there."

Attrib. to Jesus Christ.

Courtesy Sheelagh de Vries.
From Jesus and Christian Origens Outside the New Testament, p. 130: "The most famous instance of their ascription to Jesus in Muslim tradition is on the main gateway of the mosque erected in 1601 at Fathpur-Sikri, south of Delhi, by the Moghul Akbar the Great; it bears the inscription: 'Jesus, on whom be peace, said: "This world is a bridge. Pass over it; but do not build your dwelling there."'"
See also http://www.gospelthomas.com/gospelthomas42.html