If you attempt certain things ...

If you attempt certain things at the right time, they are easy to accomplish - in fact, they almost get done by themselves. If you undertake them before the time is right, not only will they fail, but they will often become impossible to accomplish even when the time would have been right.
 Francesco Guicciardini

Quotes from the same author

I know no man who feels deeper disgust than I do at the ambition, avarice, and profligacy of the priesthood, as well because every one of these vices is odious in itself, as because each of them separately and all of them together are utterly abhorrent in men making profession of a life dedicated to God.
 Francesco Guicciardini
The affairs of this world are so shifting and depend on so many accidents, that it is hard to form any judgment concerning the future; nay, we see from experience that the forecasts even of the wise almost always turn out false.
 Francesco Guicciardini
Pay no heed to those who tell you that they have relinquished place and power of their own accord, and from their love of quiet. For almost always they have been brought to this retirement by their insufficiency and against their will.
 Francesco Guicciardini
As it is our nature to be more moved by hope than fear, the example of one we see abundantly rewarded cheers and encourages us far more than the sight of many who have not been well treated disquiets us.
 Francesco Guicciardini
The return we reap from generous actions is not always evident.
 Francesco Guicciardini