O you who believe! Remember Allah with much remembrance
Soorah al-Ahzaab, Aayah 41

And for men and women who engage much in Allah's remembrance, for them has Allah prepared forgiveness and great reward. Soorah al-Ahzaab, Aayah 35

And bring your Lord to remembrance in your [very] soul, with humility and remember without loudness in words, in the mornings and evenings; and be not of those who are unheedful.
Soorah al-A'raaf, Aayah 205

The Prophet (sal-Allahu'alayhe wa sallam) said: The comparison of the one who remembers Allah and the one who does not remember Allah, is like that of the living and the dead. [al-Bukhari with al-Fat.h 11/208 and Muslim 1/539]

He (sal-Allahu `alayhe wa sallam) also said: Should I not inform you of the best of deeds, and the most sanctifying of deeds before your Lord, which does more to raise your positions [with Him], and are better for you than the disbursement of gold and money or battle with the enemy?
They [the companions] said: "Indeed! Inform us."
He (sal-Allahu `alayhe wa sallam) then said: Remembrance of Allah (Subhaanahu wa Ta'aala.
[al-Tirmidhee 5/459 and Ibn Maajah 2/1245, see: Saheeh Ibn Maajah 2/316 and Saheeh at-Tirmidhee 3/139]

The Prophet (sal-Allahu `alayhe wa sallam) also said: Allah (Subhaanahu wa Ta'aala) says: "Indeed I am as My servant presumes Me to be, and I am with him when he remembers Me, so if he remembers Me to himself I remember him to Myself, and if he remembers Me amongst a company I remember him amongst a company greater than it, and if he draws near to Me the span of a hand I draw near to him the span of an arm, and if he draws near to Me the span of an arm I draw near to him the span of two outstretched arms, and if he takes a step towards Me I hastily step towards him"
[al-Bukhari 8/171 and Muslim 4/2061,

On the authority of 'Abdullaah Ibn Busr (radhi-yAllahu 'anhu): "A man said to the Prophet (sal-Allahu `alayhe wa sallam): "O Messenger of Allah, the rites of Islam are much for me, so tell me of something that I might hold fast to" He (sal-Allahu `alayhe wa sallam) said: Let not your tongue cease from the remembrance of Allah.
[al-Tirmidhee 5/458 and Ibn Maajah 2/1246, see: Saheeh at-Tirmidhee 3/139 and Saheeh Ibn Maajah 2/317]

The Prophet (sal-Allahu `alayhe wa sallam) also said: Whoever recites a letter of Allah's Book has for it, a merit and ten more like it, not to say that alif, laam, meem are one letter but rather alif is a letter, laam is a letter and meem is a letter.
[al-Tirmidhee 5/175, see: Saheeh at-Tirmidhee 3/9 and Saheeh al-Jaami' as-Sagheer 5/340]

The Prophet (sal-Allahu `alayhe wa sallam) also said: Whoever takes a seat and fails to remember Allah, has incurred upon himself a loss from Allah, and whoever lies down [relaxes] and fails to remember Allah, has incurred upon himself a loss from Allah.
[Abu Daawood 4/264 and others, see: Saheeh al-Jaami' 5/342.]

Please note: All supplications are taken from the English translation of Hisnul-Muslim ("Fortification of the Muslim through Remembrance and Supplication from the Qur.aan and Sunnah"), as published by Invitation To Islam.
Allah always gives His best to those who leave the choice with Him.