Bahá’í Sacred Writings, Bahá’u’lláh, #108

We fain would hope that through thine exertions the wings of men may be sanctified from the mire of self and desire, and be made worthy to soar in the atmosphere of God’s love. Wings that are besmirched with mire can never soar. Unto this testify they who are the exponents of justice and equity, and yet the people are in evident doubt.