For the mystic the repose of 'unitary experience' is something final...
For the mystic the repose of 'unitary experience' is something final; for the Prophet it is the awakening within him and the unleashing psychological forces, calculated to completely transform the human world." (The Reconstruction of Religious Thought in Islam, p. 124). (iv) Sincerity of Purpose: As the Prophets have a trust in Allah and are never oblivious of the mission entrusted to them by Him, they accomplish their duty with utmost sincerity.
They have no aim other than the guidance of humanity as ordered by Allah, and ask for no remuneration for the performance of their mission. The Holy Qur'an in Surah ash-Shu'ara has summed up what many of the Prophets said to their peoples. Of course every Prophet had a message for his people which were suited to the problems they faced. Anyhow there was a point which was revealed in the message of every Prophet. Each of them said: "I want no remuneration or wages from you".
Therefore sincerity is one of the distinguishing features of Prophethood; and that is why the message of the Prophets has always been so firm. As the Prophets felt that they had been 'raised' and they did not entertain the least doubt about the fact that they had been entrusted with an essential and useful mission, preached their message and defended it with unprecedented firmness and utmost conviction.
When Prophet Musa and his brother, Harun went to Fir'awn, they had no appurtenances with them except the woolen clothes on their body and their wooden staffs in their hands. They asked Fir'awn to accept their message and told him firmly that if he would accept it, his honour would be safeguarded, otherwise he would lose his government. Fir'awn was stunned by what they said.
In the early days of his Prophethood when the number of the Muslims did not exceed that of the fingers of the two hands, the Holy Prophet of Islam one day, known in history as the Day of the Warning, assembled elders of the Bani Hashim, conveyed his message to them and firmly and expressly told them that his religion was going to spread throughout the world and that it was in their own interest to embrace it. To them these words were unbelievable.
They looked at each other with wide open eyes and dispersed without uttering a word.