An-Najm (The Star) 53:39
وَأَن لَّيْسَ لِلْإِنسَانِ إِلَّا مَا سَعَى
And that a man shall not deserve but (the reward of) his own effort.
Al-Hadid (Iron) 57:23
لِكَيْلَا تَأْسَوْا عَلَى مَا فَاتَكُمْ وَلَا تَفْرَحُوا بِمَا آتَاكُمْ وَاللَّهُ لَا يُحِبُّ كُلَّ مُخْتَالٍ فَخُورٍ
[Know this,] so that you may not despair over whatever [good] has escaped you nor exult [unduly] over whatever [good] has come to you:  for, God does not love any of those who, out of self-conceit, act in a boastful manner.
Imam Ali (AS) said, 'People, in their effort to avoid disgrace, rush headlong into it.’
Imam Ali (AS) said, 'So take a lesson from how Allah dealt with Iblis [Satan], when He thwarted his great works and his extensive efforts [because of the vanity of a single moment] even though he had been worshipping Allah for six thousand years, each hour of which was so long that it is not known whether they were years by the reckoning of this world or the next.’
Imam al-Sadiq (AS) said, ‘Whoever from among our companions seeks assistance from one of his brothers, who does not exercise his full efforts [in trying to help him], then he has betrayed Allah and His messenger and the believers.’
‘If your brother comes to your house [uninvited] then offer him whatever you have in the house, and if you invite him, then make a special effort for him.’
‘May Allah have mercy on the people who are a lamp and a beacon. They call to our cause with their actions and the best of their efforts.’
The Prophet (SAWA) said, ‘He who swindles (frauds) a fellow Muslim brother, Allah snatches away the benediction in his sustenance, thwarts his efforts at earning a livelihood, and relegates him to his own base self.’
Imam al-Husayn (AS) said, ‘Know that the evil of war is swift, and its taste is bitter. Therefore, he who prepares for it, and sees to its requirements, and does not suffer its wounds before its onset, he is its master; but he who plunges into it before its proper time and before gaining insight into his own effort therein, he is fit not to benefit his people and to ruin himself.’http://islamicblessings.com/upload/Meezan%20ul%20Hikmah%20-English.pdf
Strength and growth come only through continuous effort and struggle.
Education comes from within; you get it by struggle and effort and thought.
Happiness lies in the joy of achievement and the thrill of creative effort.
Satisfaction lies in the effort, not in the attainment, full effort is full victory.
Quality is never an accident. It is always the result of intelligent effort.
A garden requires patient labor and attention. Plants do not grow merely to satisfy ambitions or to fulfill good intentions. They thrive because someone expended effort on them.
With hard work and effort, you can achieve anything.
Effort only fully releases its reward after a person refuses to quit.
Continuous effort - not strength or intelligence - is the key to unlocking our potential.
Good character is not formed in a week or a month. It is created little by little, day by day. Protracted and patient effort is needed to develop good character.