The Sun of Truth is the Word of God upon which dependeth the education of those who are endowed with the power of understanding and of utterance. It is the true spirit and the heavenly water, through whose aid and gracious providence all things have been and will be quickened. Its appearance in every mirror is conditioned by the colour of that mirror. For instance, when its light is cast upon the mirrors of the hearts of the wise, it bringeth forth wisdom. In like manner when it manifesteth itself in the mirrors of the hearts of craftsmen, it unfoldeth new and unique arts, and when reflected in the hearts of those that apprehend the truth it revealeth wondrous tokens of true knowledge and discloseth the verities of God's utterance. (Baha’u’llah, From a Tablet; The Compilation of Compilations, vol. III, The Importance of Arts in Promoting the Faith)
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Live ye one with another, O people, in radiance and joy. By My life! All that are on earth shall pass away, while good deeds alone shall endure; to the truth of My words God doth Himself bear witness. (Baha’u’llah, The Kitab-i-Aqdas)
From ‘Abdu’l-Bahá
And among His [Baha’u’llah’s] signs is the sublimity of His
grandeur, His exalted state, His towering glory, and the shining out of His
beauty above the horizon of the Prison: so that heads were bowed before Him and
voices lowered, and humble were the faces that turned His way. This is a proof
never witnessed in the ages gone before.
Again among His signs are the extraordinary things He continually did, the miracles He performed, the wonders appearing from Him without interruption like the streaming down of His clouds -- and the acknowledgement, even by unbelievers, of His powerful light. By His own life! This was clearly verified, it was demonstrated to those of every persuasion who came into the presence of the living, the self-subsisting Lord. (‘Abdu'l-Baha, Selections from the Writings of ‘Abdu'l-Baha)
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Make ye then a mighty effort, that the purity and sanctity which, above all else, are cherished by ‘Abdu'l-Bahá, shall distinguish the people of Bahá; that in every kind of excellence the people of God shall surpass all other human beings; that both outwardly and inwardly they shall prove superior to the rest; that for purity, immaculacy, refinement, and the preservation of health, they shall be leaders in the vanguard of those who know. And that by their freedom from enslavement, their knowledge, their self-control, they shall be first among the pure, the free and the wise. (‘Abdu’l-Baha, "Selections from the Writings of ‘Abdu'l-Bahá"; The Compilation of Compilations, vol. I, Excellence in All Things)