A wise man should not remove himself (from the preceptor's abode) without requesting the preceptor; nor should he even speak or think “I do this” (i.e. I make this gift). This is the fourth step of asceticism.
नाचार्यस्यानपाकृत्य प्रवास प्राज्ञः कुर्वीतं नैतदहं करोमि। इतीव मन्येत न भाषयेत स वै चतुर्थो ब्रह्मचर्यस्य पादः॥