Objectively speaking, Ling Feng did not want Mo Wen to go looking for the Blood Evil Temple and make them their first opponent. After all, the Blood Evil Temple's ability was very powerful. Because of the existence of Yang Zonglin, they could even be ranked among the top three. With Mo Wen directly challenging the Blood Evil Temple it would very likely cause them to, once again, be crushed at the hands of the Blood Evil Temple.
After all, Yang Zonglin alone could compare with five people from other sects. He was a terrifying force to be reckoned with.
If Mo Wen chose other sects, they might be able to battle against some and win, causing the Dafang Sect to also be ranked among the top eight most powerful sects. But if they chose the Blood Evil Temple their chances were rather slim. In the end, it could even be a futile attempt.