The Holy Quran is the word of Allah (swt), not that of a human. Thus, the verse says:

(وَالَّذِينَ آمَنُوا وَعَمِلُوا الصَّالِحَاتِ) (But those who believed and did righteous deeds): Allah (swt) then places a parenthetical clause between the beginning and end of the verse, saying:

(لَا نُكَلِّفُ نَفْسًا إِلَّا وُسْعَهَا) (We charge no soul except [within] its capacity): Faith is an action of the heart but it is not enough, it must be followed by physical action. A person might claim to be a believer, but then lies, or accept bribery, or slanders, or steals, or kills, or harms his neighbors. The Prophet (saws) said:

“ The one who sleeps satiated and knows that his neighbour is hungry has not believed in me [completely/perfectly] “[1]

It is not enough to be just a Muslim, it is a matter of faith, which is the action of the heart and the harmonious combination of the emotional and physical actions leads to a conduct in line with the Islamic beliefs. That is why many verses which talk about faith are always connected with good deeds. Allah (swt) says:

 وَالْعَصْرِ (1) إِنَّ الْإِنسَانَ لَفِي خُسْرٍ (2) إِلَّا الَّذِينَ آمَنُوا وَعَمِلُوا الصَّالِحَاتِ وَتَوَاصَوْا بِالْحَقِّ وَتَوَاصَوْا بِالصَّبْرِ (3)

((1) By time (2) Indeed, mankind is in loss (3) Except for those who have believed and done righteous deeds and advised each other to truth and advised each other to patience.) (Al-Asr)

So; to avoid loss, people should not do bad deeds, they should rather do what is good for them and for others. The Prophet (saws) said:

“Iman has sixty odd or seventy odd branches. The uppermost of all these is the Testimony of Faith: ‘La ilaha illallah’ (there is no true god except Allah) while the least of them is the removal of harmful object from the road.”[2]

Even the simple act of removing a harmful object off the road is a branch of faith, because it is an action of the body.

( لَا نُكَلِّفُ نَفْسًا إِلَّا وُسْعَهَا) (We charge no soul except [within] its capacity): This parenthetical phrase shows the greatness of the Holy Quran. As if Allah (swt) is saying to the children of Adam: “Beware of thinking that the path of goodness and faith are more than what you can bear”. The religion limits human desires and whims to which the selves are very eager, but it only puts limits and controls to these desires without suppressing them. For example, sexual desires can be satisfied within marriage, the desire for food is satisfied with the various sorts of food we are allowed to eat except for the flesh of swine, all drinks are permissible except for alcohol. People should know that when they are commanded to do something, then they are certainly capable of doing that command, just like fasting for a whole month, as long as there is a human being who is equal to you and a member of your own species is able to do the command, then whoever does not abstain from these forbidden things is a sinner and cannot blame it on the difficulty of the duty. As such is for praying five times a day, or giving a sum of money as alms, or pilgrimage, or refraining from slander, or when He (swt) commanded us not to lie, so we know that we are capable of being honest. We should never think that entering into Paradise is highly complicated. Allah (swt) says: (But those who believed and did righteous deeds – We charge no soul except [within] its capacity), this refers to the believers who do good deeds, and the parenthesis means that it was all within their abilities and not something out of their reach. When Allah (swt) commands something, but then an emergency or a disaster falls upon a person that he is no longer able to fulfil Allah’s (swt) command, just in that case Allah (swt) reduces the burden on him. Like when Allah (swt) says:

 أَيَّامًا مَّعْدُودَاتٍ ۚ فَمَن كَانَ مِنكُم مَّرِيضًا أَوْ عَلَىٰ سَفَرٍ فَعِدَّةٌ مِّنْ أَيَّامٍ أُخَرَ ۚ وَعَلَى الَّذِينَ يُطِيقُونَهُ فِدْيَةٌ طَعَامُ مِسْكِينٍ ۖ فَمَن تَطَوَّعَ خَيْرًا فَهُوَ خَيْرٌ لَّهُ ۚ وَأَن تَصُومُوا خَيْرٌ لَّكُمْ ۖ إِن كُنتُمْ تَعْلَمُونَ

([Fasting for] a limited number of days. So whoever among you is ill or on a journey [during them] – then an equal number of days [are to be made up]. And upon those who are able [to fast, but with hardship] – a ransom [as substitute] of feeding a poor person [each day]. And whoever volunteers excess – it is better for him. But to fast is best for you, if you only knew.) (Al-Baqara: 184)

If a person is unable to pray while standing, then he can pray in a seated position, if someone does not have enough money, then he does not pay alms, and performing pilgrimage is demanded from those who are capable of doing it.

[1] Al-Mujam Al-Kabeer by Al-Tabarani, Hadith No. 751.

[2] Sahih Muslim, the Book of Faith, Hadith No. 35.