The Holy Prophet (S) said: "O' people! Verily, there is no prophet after me, nor any Ummah after you (Muslims). So, take care to worship your Lord, perform your five ritual prayers, fast in the appointed month (Ramadan), make pilgrimage to the House of your Lord (Mecca), give the alms of your wealth in order to purify your souls thereby, and obey the Holders of Authority, so that you enter the Paradise of your Lord."
Khisal as-Saduq, p. 152
Imam Amir-ul-Mu'mineen ‘Ali (‘a) said: "Having the Greatness of the Creator in your mind would make you realize the insignificance of the creatures in your view."
Nahjul-Balagha, Statement 129
Imam Amir-ul-Mu'mineen ‘Ali (‘a) said: " Blessed is he who sincerely devotes the entirety of his actions, knowledge, love, hatred, receiving, relinquishing, speech, silence, deeds, and statements absolutely to Allah."
Bihar-ul-Anwar, vol. 77, p. 289
Imam as-Sadiq (‘a) said: "The heart is the sanctuary of Allah, therefore, do not settle therein anything but Allah (The sacred place of the heart belongs to and Him alone. Therefore, keep the love of the world out of it.)
Bihar-ul-Anwar, vol. 70, p. 25
Imam as-Sadiq (‘a) said: "Our true followers are those who, when they are alone, remember Allah abundantly." (That is, they avoid committing vices in private where there is no barrier for them to commit sin by the mere remembrance of Allah.)
Bihar-ul-Anwar, vol. 93, p. 162
Imam al-Baqir (‘a) said: "By Allah, He, the Exalted, expects of people but two traits: that they confess for Him the blessings in order that He increases His bounties for them; and that they make confessions about their evil actions and then He forgives those sins for them."
Al-Kafi, vol. 2, p. 426
Imam Husayn ibn ‘Ali (‘a) said: "Verily, Allah, the Exalted, has not created human beings except for recognizing Him and worshipping Him as (the consequence of) knowing Him; and when they worship Him they would lack the need of adoring any human being (or things) other than Him because of that worship."
Safinat-ul-Bihar, vol. 2, p. 180
The fourth Imam, ‘Ali ibn Husayn (‘a) said: "There is no destruction (Hell) for a believer having three qualities:
Confessing that there is no god besides Allah, the One Who has no partner; the intercession of the Messenger of Allah and the vastness of the Grace of Allah.
Safinat-ul-Bihar, p. 517