It is impossible for a muslim to be absolutely loyal to Allah, His Messenger and to the believers without a sound understanding of the meaning of Tawhid, without a firm grasp of the meaning of the words, THE IS NO GOD BUT ALLAH AND MUHMMAD IS THE MESSENGER OF ALLAH. Everyone must realise what this means and what it requires of those who claim to believe it. After this you must understand the nature of ignorance, shirk, disbelief, apostasy and hypocrisy, in order that you may never become unwillingly entangled in any of it. No one can appreciate Islam without understanding what it is to be without it. After this there must be a firm grasp of the principles of alliance and dissociation, according to Qur’an and Sunnah. This is to say, alliance is loving and helping the believers regardless of whom they are, regardless of the and with his life. He feels his pain and his pleasure, and he shares his anger. He denounces all Allah’s enemies; disbeliever, hypocrites and apostates. His attitude towards them is that of the warrior against the mortal foe, he will struggle with his heart and his tongue, his wealth and his life, he will fight him with his last degree of strength.
Taken once again from the book Al Wala wal Bara. volume 2, page 231-232.