Purpose:
Arts, crafts and sciences uplift the world of being, and are conducive to its exaltation. Knowledge is as wings to man’s life, and a ladder for his ascent. Its acquisition is incumbent upon everyone. The knowledge of such sciences, however, should be acquired as can profit the peoples of the earth, and not those which begin with words and end with words. Great indeed is the claim of scientists and craftsmen on the peoples of the world.
(Baha’u’llah: Epistle to the Son of the Wolf, pp. 26-27)

The source of crafts, sciences and arts is the power of reflection. Make ye every effort that out of this ideal mine there may gleam forth such pearls of wisdom and utterance as will promote the well-being and harmony of all the kindreds of the earth.
(Baha’u’llah: Tablets of Baha’u’llah, p. 72)

The purpose of learning should be the promotion of the welfare of the people, and this can be achieved through crafts. It hath been revealed and is now repeated that the true worth of artists and craftsmen should be appreciated, for they advance the affairs of mankind. Just as the foundations of religion are made firm through the Law of God, the means of livelihood depend upon those who are engaged in arts and crafts. True learning is that which is conducive to the well-being of the world, not to pride and self-conceit, or to tyranny, violence and pillage.
(Baha’u’llah: The Arts, p. 3)

It behoveth the craftsmen of the world at each moment to offer a thousand tokens of gratitude at the Sacred Threshold, and to exert their highest endeavour and diligently pursue their professions so that their efforts may produce that which will manifest the greatest beauty and perfection before the eyes of all men.
(`Abdu’l-Baha: Selections … `Abdu’l-Baha, p. 145)

Work is Worship:
Strive as much as possible to become proficient in the science of agriculture, for in accordance with the divine teachings the acquisition of sciences and the perfection of arts are considered acts of worship. If a man engageth with all his power in the acquisition of a science or in the perfection of an art, it is as if he has been worshipping God in churches and temples.
(`Abdu’l-Baha: Selections … `Abdu’l-Baha, p. 144)

In this great dispensation, art (or a profession) is identical with an act of worship and this is a clear text of the Blessed Perfection. Therefore, extreme effort should be made in art and this will not prevent the teaching of the people in that region. Nay, rather, each should assist the other in art and guidance. For instance, when the studying of art is with the intention of obeying the command of God this study will certainly be done easily and great progress will soon be made therein; and when others discover this fragrance of spirituality in the action itself, this same will cause their awakening.
(`Abdu’l-Baha: Baha’i World Faith, p. 377)

Science:
The highest praise is due to men who devote their energies to science, and the noblest center is a center wherein the sciences and arts are taught and studied. Science ever tends to the illumination of the world of humanity. It is the cause of eternal honor to man, and its sovereignty is far greater than the sovereignty of kings.
(`Abdu’l-Baha: Promulgation of Universal Peace, p. 348)

Therefore, you should put forward your most earnest efforts toward the acquisition of science and arts. The greater your attainment, the higher your standard in the divine purpose. The man of science is perceiving and endowed with vision, whereas he who is ignorant and neglectful of this development is blind. The investigating mind is attentive, alive; the callous and indifferent mind is deaf and dead. A scientific man is a true index and representative of humanity, for through processes of inductive reasoning and research he is informed of all that appertains to humanity, its status, conditions and happenings. He studies the human body politic, understands social problems and weaves the web and texture of civilization. In fact, science may be likened to a mirror wherein the infinite forms and images of existing things are revealed and reflected. It is the very foundation of all individual and national development. Without this basis of investigation, development is impossible. Therefore, seek with diligent endeavor the knowledge and attainment of all that lies within the power of this wonderful bestowal.
(`Abdu’l-Baha: Promulgation of Universal Peace, p. 50)

In this new and wondrous Age, the unshakeable foundation is the teaching of sciences and arts. According to explicit Holy Texts, every child must be taught crafts and arts, to the degree that is needful.
(`Abdu’l-Baha: Selections … `Abdu’l-Baha, p. 134)

The Art of Music:
We, verily, have made music as a ladder for your souls, a means whereby they may be lifted up unto the realm on high; make it not, therefore, as wings to self and passion.
(Baha’u’llah: The Kitab-i-Aqdas, p. 38)

The musician’s art is among those arts worthy of the highest praise, and it moveth the hearts of all who grieve.
(`Abdu’l-Baha: Selections … `Abdu’l-Baha, p. 112)

The art of music is divine and effective. It is the food of the soul and spirit. Through the power and charm of music the spirit of man is uplifted. It has wonderful sway and effect in the hearts of children, for their hearts are pure, and melodies have great influence in them. The latent talents with which the hearts of these children are endowed will find expression through the medium of music. Therefore, you must exert yourselves to make them proficient; teach them to sing with excellence and effect. It is incumbent upon each child to know something of music, for without knowledge of this art the melodies of instrument and voice cannot be rightly enjoyed. Likewise, it is necessary that the schools teach it in order that the souls and hearts of the pupils may become vivified and exhilarated and their lives be brightened with enjoyment.
(`Abdu’l-Baha: Promulgation of Universal Peace, p. 52)

Try, if thou canst, to use spiritual melodies, songs and tunes, and to bring the earthly music into harmony with the celestial melody. Then thou wilt notice what a great influence music hath and what heavenly joy and life it conferreth. Strike up such a melody and tune as to cause the nightingales of divine mysteries to be filled with joy and ecstasy.
(`Abdu’l-Baha: Music, p. 76)