Adam Clarke's Commentary on the Bible - Hebrews 11:1
Faith is the substance of things hoped for - Εστι δε πιστις ελπιζομενων ὑποστασις· Faith is the Subsistence of things hoped for; πραγματων ελεγχος ου βλεπομενων· The Demonstration of things not seen. The word ὑποστασις , which we translate substance, signifies subsistence, that which becomes a foundation for another thing to stand on. And ελεγχος signifies such a conviction as is produced in the mind by the demonstration of a problem, after which demonstration no doubt can remain,... read more
John Gills Exposition of the Bible Commentary - Hebrews 11:6
But without faith it is impossible to please him ,.... Or do things well pleasing in his sight; or any of the duties of religion, in an acceptable way; as prayer, praise, attendance on the word and ordinances, or any good works whatever; because such are without Christ, and without his Spirit; and have neither right principles, nor right ends: for this is not to be understood of the persons of God's elect, as considered in Christ; in whom they are well pleasing to him before faith; being... read more