A saint is one who leads a life of purity, one who has freed himself from all human weaknesses and imperfections.

‘Abdu’l-Bahá, Paris Talks, p. 60

As to the soul of man after death, it remains in the degree of purity to which it has evolved during life in the physical body, and after it is freed from the body it remains plunged in the ocean of God's Mercy.

‘Abdu’l-Bahá, Paris Talks, p. 66

But there are other forbidden things which do not cause immediate harm, and the injurious effects of which are only gradually produced: such acts are also repugnant to the Lord, and blameworthy in His sight, and repellent. The absolute unlawfulness of these, however, hath not been expressly set forth in the Text, but their avoidance is necessary to purity, cleanliness, the preservation of health, and freedom from addiction. Among these latter is smoking tobacco, which is dirty, smelly, offensive -- an evil habit, and one the harmfulness of which gradually becometh apparent to all. Every qualified  physician hath ruled -- and this hath also been proven by tests -- that one of the components of tobacco is a deadly poison, and that the smoker is vulnerable to many and various diseases. This is why smoking hath been plainly set forth as repugnant from the standpoint of hygiene.

‘Abdu’l-Bahá, Selections from the Writings of ‘Abdu’l-Bahá, p. 147-148

Dignity before God depends, not on sex, but on purity and luminosity of heart.

‘Abdu’l-Bahá, Paris Talks, p. 162

First in a human being's way of life must be purity, then freshness, cleanliness, and independence of spirit. First must the stream bed be cleansed, then may the sweet river waters be led into it. Chaste eyes enjoy the beatific vision of the Lord and know what this encounter meaneth; a pure sense inhaleth the fragrances that blow from the rose gardens of His grace; a burnished heart will mirror forth the comely face of truth.

‘Abdu’l-Bahá, Selections from the Writings of ‘Abdu’l-Bahá, p. 146-147

God seeketh fellowship, purity, sanctity and long-suffering; these are the attributes of Divinity.

‘Abdu’l-Bahá, The Promulgation of Universal Peace, p. 290