Drink thou as much as thou canst from this overflowing cup of the love of God and then cause others to drink; take thou a portion from this ocean of guidance and then suffer others to share.

‘Abdu’l-Bahá, Tablets of ‘Abdu’l-Bahá v3, p. 668

Ponder the words of Jesus addressed to His disciples, as He sent them forth to propagate the Cause of God. In words such as these, He bade them arise and fulfil their mission: 'Ye are even as the fire which in the darkness of the night has been kindled upon the mountain-top. Let your light shine before the eyes of men. Such must be the purity of your character and the degree of your renunciation, that the people of the earth may through you recognize and be drawn closer to the heavenly Father who is the Source of purity and grace. For none has seen the Father who is in heaven. You who are His spiritual children must by your deeds exemplify His virtues, and witness to His glory. You are the salt of the earth, but if the salt have lost its savour, wherewith shall it be salted?

Shoghi Effendi, The Dawn-Breakers, p. 92

The people in general are all asleep; they are all inadvertent; they are all slumbering, because their thoughts are confined to materialism; they are not at all thoughtful of God's thoughts except you, who are thinking of God. Verily, you are the spirit of the world! You are the cause of the light of the world! You are the salt of the earth!

Bahá’í Scriptures, p. 372-373