Post on first page

i did my blog frasesfamosas.es with that theme, but i have a problem and not find how to fix.
sorry first for my english, no easy for me to explain very good, hope understand my problem.
When i do posts, on first page i see the posts, i like to see just 2-3 lines and when click on the post inside have more .
but example Gandhi on first page i want have 2 lines, but show all together, if click and see all i wrote, show in diferent lines, but cant do that to see some in first page