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The real test of a saint is not one's willingness to preach the gospel, but one's willingness to do something like washing the disciples' feet - that is, being willing to do those things that seem unimportant in human estimation but count as everything to God.

Oswald Chambers (2010). “My Utmost for His Highest”, p.130, Discovery House
The real test of a saint is not one's willingness to preach the gospel, but one's willingness to do something like washing the disciples' feet - that is, being willing to do those things that seem unimportant in human