Mark 4:33
And with many such parables spake he the word unto them, as they were able to hear it.
Cross-reference
Matthew 13:34 parallels Mark 4:33, both noting Jesus taught exclusively in parables to the crowds.
In John 16:12, Jesus similarly withholds teaching because the disciples cannot bear it yet—same principle of adapting to the listener's readiness.
In 1 Corinthians 3:1, Paul echoes the same limitation—he addresses them as fleshly, not spiritual, because they were not ready.
In 1 Corinthians 3:2, Paul uses milk and solid food to illustrate teaching adapted to spiritual maturity—exactly the principle Jesus used.
In Hebrews 5:11-14, the writer rebukes them for being dull of hearing and needing milk, not solid food—same concept of teaching according to capacity.
In Matthew 13:10, the disciples ask Jesus why he speaks in parables—this is the parallel passage to Mark 4:33, providing the immediate context.
In Matthew 13:53, the parable discourse concludes—this is the parallel conclusion to the same teaching event in Mark 4:33.