هُمُ الَّذِينَ يَبْدَءُونَ بِصِغَارِ مَسَاءِلِ الْعِلْمِ قَبْلَ كِبَارِهِ
يُرَبُّونَ أَنْفُسَهُمْ وَطُلَّابِهِمْ اِبْتِدَاءً مِنَ الْمَسَاءِلِ الصَّضِيرَةِ إلَى الْمَسَاءِلِ الْكَبِيرَةِ
They are those who begin with the small matters of knowledge before the greater ones. They cultivate themselves and their students beginning with the smaller matters and moving on to the larger matters.
(From Explanation of the Three Principles by Shaykh Saalih al Fawzaan)
For a longer explanation in pdf format CLICK HERE