The willing, Destiny guides them; the unwilling, Destiny drags them.

Seneca the Younger (c. 4 BC-AD 65) Roman statesman, philosopher, playwright [Lucius Annaeus Seneca]

Moral Letters to Lucilius [Epistulae morales ad Lucilium], “On Obedience to the Universal Will”

Actually translating Cleanthes. Alt. trans: "Fate leads, but the unwilling drags along." "Fate leads the willing and drags along the unwilling." R. Gummere: "Aye, the willing soul / Fate leads, but the unwilling drags along." Source. Sometimes attributed to Seneca the Elder.