Adam Clarke on Luke 6:46

Lord, Lord - God judges of the heart, not by words, but by works. A good servant never disputes, speaks little, and always follows his work. Such a servant a real Christian is: such is a faithful minister, always intent either on the work of his own salvation, or that of his neighbor; speaking more to God than to men; and to these as in the presence of God. The tongue is fitly compared by one to a pump, which empties the heart, but neither fills nor cleanses it. The love of God is a hidden spring, which supplies the heart continually, and never permits it to be dry or unfruitful. Quesnel.