Things bad begun make strong themselves by ill.

Thou marvell'st at my words, but hold thee still; Things bad begun make strong themselves by ill.

To show our simple skill, That is the true beginning of our end.

We come to beginnings only at the end

What's well begun, is half done. [Lat., Dimidium facti qui coepit habet.]

Resist beginnings: it is too late to employ medicine when the evil has grown strong by inveterate habit. [Lat., Principiis obsta: sero medicina paratur, Cum mala per longas convaluere moras.]