Many human activities, good in themselves, are not good because of the motive for which they are done. For example, fasting and vigils, prayer and psalmody, acts of charity and hospitality are by nature good, but when performed for the sake of self-esteem they are not good.
St. Maximos the Confessor
God never so abandons His Church that worthy servants of the altar in sufficient numbers are not to be found, if only the worthy are ordained and the unworthy debarred from ordination.
St. Thomas Aquinas
We must not leave off our prayers because of distractions and restlessness of mind, although it seems useless to go on with them. He who perseveres for the whole of his accustomed time, gently recalling his mind to the subject of his prayer, merits greatly.
St. Philip Neri
You will not see anyone who is really striving after his advancement who is not given to spiritual reading. And as to him who neglects it, the fact will soon be observed by his progress.
St. Athanasius