Rome wasn't built in a day

अटनेन महारण्ये
सुपन्थाः जायते शनैः ।
वेदाभ्यासात् तथा ज्ञानम्‌
शनैः पर्वतलङ्घनम्‌ ॥

By wandering through the woods, the right path is discovered gradually. Similarly, wisdom is acquired gradually by studying the Vedas. Likewise, a mountain is gradually surpassed step by step.

Rome wasn't built in a day.
The greatest oak was once a little nut who held its ground.