It was Martin Luther himself who said:

Be a sinner, and let your sins be strong, but let your trust in Christ be stronger, and rejoice in Christ who is the victor over sin, death, and the world. We will commit sins while we are here, for this life is not a place where justice resides...

– Dr. Martin Luther's Saemmtliche Schriften, Letter No. 99, 1 Aug. 1521.

Those pious souls who do good to gain the Kingdom of Heaven not only will never succeed, but they must even be reckoned among the impious; and it is more important to guard them against good works than against sin.

– Wittenberg, VI, 160, quoted by O'Hare, in 'The Facts About Luther, TAN Books, 1987, p. 122.

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