To respond to invitations ...

Bahá’u’lláh, The Kitáb-i-Aqdas, p. 161

Whensoever ye be invited to a banquet or festive occasion, respond with joy and gladness, and whoever fulfilleth his promise will be safe from reproof.

Bahá’u’lláh, Kitab-i-Aqdas, par. 156

For a man who has love, effort is a rest. He will travel any distance to visit his friends.

‘Abdu’l-Bahá, ‘Abdu’l-Bahá in London, p. 48