Mencius - Book 2, Part 2, Chapter 2D

'Therefore a prince who is to accomplish great deeds will certainly have ministers whom he does not call to go to him. When he wishes to consult with them, he goes to them. The prince who does not honor the virtuous, and delight in their ways of doing, to this extent, is not worth having to do with.

'Accordingly, there was the behavior of T'ang to Î Yin: he first learned of him, and then employed him as his minister; and so without difficulty he became sovereign. There was the behavior of the duke Hwan to Kwan Chung: he first learned of him, and then employed him as his minister; and so without difficulty he became chief of all the princes.

'Now throughout the kingdom, the territories of the princes are of equal extent, and in their achievements they are on a level. Not one of them is able to exceed the others. This is from no other reason, but that they love to make ministers of those whom they teach, and do not love to make ministers of those by whom they might be taught.

'So did T'ang behave to Î Yin, and the duke Hwan to Kwan Chung, that they would not venture to call them to go to them. If Kwan Chung might not be called to him by his prince, how much less may he be called, who would not play the part of Kwan Chung!'
~ James Legge translation via nothingistic.org ~

Go here to read the introductory post to this serialized version of the Works of Mencius.