A 8: The best way is that declared by Allah (Glorified and Exalted be He) in His Book and the Sunnah of His Prophet (peace be upon him). Allah (Glorified and Exalted be He) says, Invite (mankind, O Muhammad ﺻﻠﻰ ﺍﷲ ﻋﻠﻴﻪ ﻭ ﺳﻠﻢ) to the Way of your Lord (i.e. Islâm) with wisdom (i.e. with the Divine Revelation and the Qur'ân) and fair preaching, and argue with them in a way that is better.
He (Exalted be He) also says: And by the Mercy of Allâh, you dealt with them gently. And had you been severe and harshhearted, they would have broken away from about you Allah (Glorified and Exalted be He) states in the story of Musa (Moses) and Harun (Aaron) when He sent them to Fir`awn (Pharaoh): "And speak to him mildly, perhaps he may accept admonition or fear (Allâh)." Therefore, the one who calls to Allah (Exalted be He)