постепенно, понемногу.
Перемены эти свершились не сразу, не вдруг, а постепенно, незаметно, капля за каплей. Горбатов, Донбасс.
капля по капле
"Everything that is beautiful and noble is the product of reason and calculation." Charles Baudelaire
"The best way to keep your friends is not to give them away." Wilson Mizner
"Silence is the mother of truth." Benjamin Disraeli
"Never forget the three powerful resources you always have available to you: love, prayer, and forgiveness." H. Jackson Brown, Jr.