Do what you ought and concentrate on what you are doing

Do everything for Love. Thus there will be no little things: everything will be big. Perseverance in little things for Love is heroism. (The Way, 813)

Do you really want to be a saint? Carry out the little duty of each moment: do what you ought and concentrate on what you are doing. (The Way, 815)

'Great' holiness consists in carrying out the 'little duties' of each moment. (The Way, 817)

You tell me: when the chance comes to do something big, then!... Then? Are you seriously trying to convince me--and to convince yourself--that you will be able to win in the supernatural Olympics without daily preparation, without training? (The Way, 822)

Have you seen how that imposing building was built? One brick upon another. Thousands. But, one by one. And bags of cement, one by one. And blocks of stone, each of them insignificant compared with the massive whole. And beams of steel. And men working, the same hours, day after day... Have you seen how that imposing building was built?... By dint of little things! (The Way, 823)

Have you noticed how human love consists of little things? Well, divine Love also consists of little things. (The Way, 824)

(http://www.opusdei.org.in/en-in/dailytext/do-what-you-ought-and-concentrate-on-what-you-are/)